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Search: id:A011268
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| A011268 |
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Triangle read by rows: number of P-graphs by number of edges and number of non-root nodes. |
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+0
1
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| 1, 1, 2, 1, 10, 3, 1, 30, 44, 4, 1, 70, 284, 134, 5, 1, 140, 1224, 1594, 329, 6, 1, 252, 4110, 11330, 6552, 700, 7, 1, 420, 11616, 58432, 71484, 21822, 1344, 8, 1, 660, 28908, 241098, 534562, 347274, 62370, 2388, 9, 1, 990, 65208, 842842, 3069360, 3612924
(list; table; graph; listen)
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OFFSET
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2,3
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REFERENCES
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R. C. Read, On the enumeration of a class of plane multigraphs, Aequat. Math., 31 (1986), 47-63.
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LINKS
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R. C. Read, On the enumeration of a class of plane multigraphs, Aequat. Math., 31 (1986), 47-63.
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FORMULA
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Reference gives generating function.
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CROSSREFS
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Sequence in context: A114692 A112691 A110169 this_sequence A099755 A110682 A110327
Adjacent sequences: A011265 A011266 A011267 this_sequence A011269 A011270 A011271
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KEYWORD
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tabl,nonn,easy,nice
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AUTHOR
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njas
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EXTENSIONS
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More terms from Pab Ter (pabrlos(AT)yahoo.com), May 27 2004
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