A075095 Number of simple graphs g on n nodes with |Aut(g)| = 2.

0, 2, 2, 3, 11, 46, 354, 4431, 89004, 3026014, 179282248, 18885632962

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Zoran Maksimovic, Number of graphs on n nodes whose automorphism group orders are k, n<=11

Eric Weisstein's World of Mathematics, Graph Automorphism

Crossrefs

Cf. A003400, A075096, A075097, A075098.

Sequence in context: A284708 A265783 A246670 * A178343 A156136 A134243

Adjacent sequences: A075092 A075093 A075094 * A075096 A075097 A075098

Keyword

nonn,hard,more,changed

Author

Eric W. Weisstein, Aug 31 2002

Extensions

a(8)-a(9) from Eric W. Weisstein, Jun 09 2004

a(10)-a(11) from Herman Jamke (hermanjamke(AT)fastmail.fm), May 04 2008

a(12) from Sean A. Irvine, Feb 09 2025

Status

approved