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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
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
Sequence in context: A092691 A064671 A363647 * A125833 A129547 A081151
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.)