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A099437
Number of simple class-2 graphs on n nodes.
2
0, 0, 1, 1, 6, 11, 50, 131, 1131
OFFSET
1,5
LINKS
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
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