id:A053528 - OEIS Search Results

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Number of bipartite graphs with 5 edges on nodes {1..n}.

+0
2

0, 0, 0, 0, 0, 60, 1701, 14952, 81228, 331884, 1116675, 3256407, 8500734, 20306286, 45093048, 94189095, 186736368, 353904096, 644842674, 1134910242, 1936817820, 3215467584, 5207403663, 8245956642, 12793342716, 19481177100, 29161079805 (list; graph; listen)

	OFFSET	`0,6`
	REFERENCES	`R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.5.`
	FORMULA	`(n-4)(n-3)(n-2)(n-1)n(n^5+5n^4+5n^3-85n^2-374n-960)/3840.`
	CROSSREFS	`Cf. A000217 (1 edge), A050534 (2 edges), A053526 (3 edges), A053527 (4 edges).` `Sequence in context: A146347 A054331 A160349 this_sequence A017776 A035725 A035800` `Adjacent sequences: A053525 A053526 A053527 this_sequence A053529 A053530 A053531`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jan 16 2000`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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