%I A058409
%S A058409 1,3,18,92,458,1982,7928,28592,95138,292993,845027,2295322,5915631,
%T A058409 14535676,34224682,77510148,169459010,358698558,737106306,1473867060,
%U A058409 2873564862
%N A058409 Number of 4 X n nonnegative integer matrices with all column sums 3, 
               up to row and column permutation.
%H A058409 Vladeta Jovovic, <a href="a58407.pdf">Number of m x l nonnegative integer 
               matrices with all column sums equal to n, up to row and column permutation</
               a>
%F A058409 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).
%Y A058409 Cf. A050532, A058390, A058407, A058408, A058410.
%Y A058409 Sequence in context: A133594 A092691 A064671 this_sequence A125833 A129547 
               A081151
%Y A058409 Adjacent sequences: A058406 A058407 A058408 this_sequence A058410 A058411 
               A058412
%K A058409 easy,nonn
%O A058409 0,2
%A A058409 Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 25 2000