id:A058409 - OEIS Search Results

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Number of 4 X n nonnegative integer matrices with all column sums 3, up to row and column permutation.

+0
3

1, 3, 18, 92, 458, 1982, 7928, 28592, 95138, 292993, 845027, 2295322, 5915631, 14535676, 34224682, 77510148, 169459010, 358698558, 737106306, 1473867060, 2873564862 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Vladeta Jovovic, Number of m x l nonnegative integer matrices with all column sums equal to n, up to row and column permutation`
	FORMULA	`G.f.: 1 / 24*(1 / (1 - x)^20 + 6 / (1 - x)^6 / (1 - x^2)^7 + 3 / (1 - x^2)^10 + 8 / (1 - x)^2 / (1 - x^3)^6 + 6 / (1 - x^4)^5).`
	CROSSREFS	`Cf. A050532, A058390, A058407, A058408, A058410.` `Sequence in context: A133594 A092691 A064671 this_sequence A125833 A129547 A081151` `Adjacent sequences: A058406 A058407 A058408 this_sequence A058410 A058411 A058412`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 25 2000`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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