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A076322 Number of connected 3-colorable (i.e. chromatic number <= 3) simple graphs on n nodes. +0
7
1, 1, 2, 5, 17, 81, 519, 5218, 81677 (list; graph; listen)
OFFSET

1,3

LINKS

Eric Weisstein's World of Mathematics, n-Colorable Graph

CROSSREFS

Cf. A005142, A076323, A076324, A076325, A076326, A076327, A076328.

Sequence in context: A001186 A125282 A020125 this_sequence A098540 A079574 A032262

Adjacent sequences: A076319 A076320 A076321 this_sequence A076323 A076324 A076325

KEYWORD

nonn,more

AUTHOR

Eric Weisstein (eric(AT)weisstein.com), Oct 06, 2002

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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.


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