Endomorphism structure of groups of order 16

This article gives specific information, namely, endomorphism structure, about a family of groups, namely: groups of order 16.
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Automorphism groups

Group	GAP ID (second part)	Order of automorphism group	Iso. class of automorphism group	Log_2 of largest power of 2 dividing automorphism group	Iso. class of 2-Sylow subgroup of automorphism group	Log_2 of order of 2-core	Iso. class of 2-core	Log_2 of order of inner automorphism group	Iso. class of inner automorphism group
cyclic group:Z16	1	8	direct product of Z4 and Z2	3	direct product of Z4 and Z2	3	direct product of Z4 and Z2	0	trivial group
direct product of Z4 and Z4	2	96	general linear group:GL(2,Z4)	5	SmallGroup(32,27)	4	elementary abelian group:E16	0	trivial group
SmallGroup(16,3)	3	32	SmallGroup(32,27)	5	SmallGroup(32,27)	5	SmallGroup(32,27)	2	Klein four-group
nontrivial semidirect product of Z4 and Z4	4	32	SmallGroup(32,27)	5	SmallGroup(32,27)	5	SmallGroup(32,27)	2	Klein four-group
direct product of Z8 and Z2	5	16	direct product of D8 and Z2	4	direct product of D8 and Z2	4	direct product of D8 and Z2	0	trivial group
M16	6	16	direct product of D8 and Z2	4	direct product of D8 and Z2	4	direct product of D8 and Z2	2	Klein four-group
dihedral group:D16	7	32	holomorph of Z8	5	holomorph of Z8	5	holomorph of Z8	3	dihedral group:D8
semidihedral group:SD16	8	16	direct product of D8 and Z2	4	direct product of D8 and Z2	4	direct product of D8 and Z2	3	dihedral group:D8
generalized quaternion group:Q16	9	32	holomorph of Z8	5	holomorph of Z8	5	holomorph of Z8	3	dihedral group:D8
direct product of Z4 and V4	10	192	SmallGroup(192,1493)	6	Upper-triangular unipotent matrix group:U(4,2)	5	inner holomorph of D8 (one of the extraspecial groups of order 32)	0	trivial group
direct product of D8 and Z2	11	64	Upper-triangular unipotent matrix group:U(4,2)	6	Upper-triangular unipotent matrix group:U(4,2)	6	Upper-triangular unipotent matrix group:U(4,2)	2	Klein four-group
direct product of Q8 and Z2	12	192	SmallGroup(192,955)	6	Upper-triangular unipotent matrix group:U(4,2)	5	SmallGroup(32,27)	2	Klein four-group
central product of D8 and Z4	13	48	direct product of S4 and Z2	4	direct product of D8 and Z2	3	elementary abelian group:E8	2	Klein four-group
elementary abelian group:E16	14	20160	alternating group:A8	6	Upper-triangular unipotent matrix group:U(4,2)	0	trivial group	0	trivial group