1,4

P. J. Cameron, Sequences realized by oligomorphic permutation groups, J. Integ. Seqs. Vol. 3 (2000), #00.1.5.

Eric Weisstein's World of Mathematics, Triangle-Free Graph

Inverse Euler transform of A006785.

Sequence in context: A148571 A148572 A052393 this_sequence A058818 A081181 A062164

Adjacent sequences: A024604 A024605 A024606 this_sequence A024608 A024609 A024610

hard,nonn,nice

Peter J. Cameron (p.j.cameron(AT)qmw.ac.uk)

2 more terms from Vladeta Jovovic (vladeta(AT)eunet.rs), May 17 2008