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A084268
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Triangle of counts of simple graphs on n nodes having chromatic number 1, ..., n.
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1
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1, 1, 1, 1, 2, 1, 1, 6, 3, 1, 1, 12, 16, 4, 1, 1, 34, 84, 31, 5, 1, 1, 87, 579, 318, 52, 6, 1, 1, 302, 5721, 5366, 867, 81, 7, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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LINKS
| Eric Weisstein's World of Mathematics, n-Chromatic Graph
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EXAMPLE
| 1; 1, 1; 1, 2, 1; 1, 6, 3, 1; ...
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CROSSREFS
| Cf. A076278, A076279, A076280, A076281, A076282, A076283, A084269.
Sequence in context: A112477 A156984 A181621 * A201198 A120258 A201922
Adjacent sequences: A084265 A084266 A084267 * A084269 A084270 A084271
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KEYWORD
| nonn,more,tabl
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), May 24, 2003
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