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A099437 Number of simple class-2 graphs on n nodes. 2
0, 0, 1, 1, 6, 11, 50, 131, 1131 (list; graph; refs; listen; history; text; internal format)
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 * A271093 A271291 A271085

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

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Last modified June 26 12:34 EDT 2022. Contains 354883 sequences. (Running on oeis4.)