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A076278
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Number of 2-chromatic (i.e. chromatic number equals 2) simple graphs on n nodes.
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10
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0, 1, 2, 6, 12, 34, 87, 302, 1118, 5478, 32302, 251134, 2527711, 33985852, 611846939, 14864650923, 488222721991, 21712049275197, 1308300679611468, 106897965189674290
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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LINKS
| Keith M. Briggs, Combinatorial Graph Theory
Eric Weisstein's World of Mathematics, n-Chromatic Graph
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FORMULA
| a(n) = A033995(n)-1.
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CROSSREFS
| Cf. A076279, A076280, A076281, A076282, A115597.
Sequence in context: A096610 A164099 A088808 * A204512 A099576 A026549
Adjacent sequences: A076275 A076276 A076277 * A076279 A076280 A076281
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KEYWORD
| nonn,more
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), Oct 06, 2002
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 31 2003
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