1,6
Table of n, a(n) for n=1..9.
Zoran Maksimovic, Number of graphs on n nodes whose automorphism group orders are k, n<=11
Eric Weisstein's World of Mathematics, Graph Automorphism
Sequence in context: A000387 A145221 A027148 * A027268 A000388 A227769
Adjacent sequences: A095851 A095852 A095853 * A095855 A095856 A095857
nonn,more
Eric W. Weisstein, Jun 09 2004
approved