1,1

Table of n, a(n) for n=1..5.

Eric Weisstein's World of Mathematics, Independent Vertex Set

Eric Weisstein's World of Mathematics, Sierpinski Sieve Graph

Eric Weisstein's World of Mathematics, Vertex Cover

Sequence in context: A003010 A118770 A226943 * A112514 A001140 A177363

Adjacent sequences: A292705 A292706 A292707 * A292709 A292710 A292711

nonn,more

Eric W. Weisstein, Sep 21 2017

approved