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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: A272492 A092691 A064671 * 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 December 12 22:06 EST 2019. Contains 329963 sequences. (Running on oeis4.)