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 A058409 Number of 4 X n nonnegative integer matrices with all column sums 3, up to row and column permutation. 2
 1, 3, 18, 92, 458, 1982, 7928, 28592, 95138, 292993, 845027, 2295322, 5915631, 14535676, 34224682, 77510148, 169459010, 358698558, 737106306, 1473867060, 2873564862, 5472731212, 10198198452, 18621343624, 33361303957, 58713103696 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..25. 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: A092691 A064671 A363647 * A125833 A129547 A081151 Adjacent sequences: A058406 A058407 A058408 * A058410 A058411 A058412 KEYWORD easy,nonn AUTHOR Vladeta Jovovic, Nov 25 2000 EXTENSIONS More terms from Max Alekseyev, Jun 21 2011 STATUS approved

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Last modified May 17 19:53 EDT 2024. Contains 372607 sequences. (Running on oeis4.)