A099437 Number of simple class-2 graphs on n nodes.

0, 0, 1, 1, 6, 11, 50, 131, 1131

Offset

1,5

Links

Table of n, a(n) for n=1..9.

Eric Weisstein's World of Mathematics, Class 2 Graph

Formula

a(n) = A000088(n) - A099435(n). - Andrew Howroyd, Sep 03 2019

Crossrefs

Cf. A000088 (graphs).

Cf. A099438 (connected class 2 graphs).

Cf. A099435 (class 1 graphs).

Sequence in context: A270020 A269878 A292120 * A368373 A271093 A271291

Adjacent sequences: A099434 A099435 A099436 * A099438 A099439 A099440

Keyword

nonn,more

Author

Eric W. Weisstein, Oct 15 2004

Extensions

a(8) from Eric W. Weisstein, Nov 17 2011

a(9) from Eric W. Weisstein, Nov 21 2011

Status

approved