1,1

Table of n, a(n) for n=1..4.

Eric Weisstein's World of Mathematics, Grid Graph

Eric Weisstein's World of Mathematics, Independent Vertex Set

Eric Weisstein's World of Mathematics, Vertex Cover

Sequence in context: A291809 A182070 A325630 * A133013 A032369 A134729

Adjacent sequences: A292699 A292700 A292701 * A292703 A292704 A292705

nonn,more

Eric W. Weisstein, Sep 21 2017

approved