This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A056080 #9 May 10 2013 12:44:30
%S A056080 1,2,14,49,131,248,410,531,601,566,474,336,222,124,67,32,16,6,3,1,1
%N A056080 Number of 5 X 5 binary matrices with n ones, with no zero rows or columns, up to row and column permutation.
%C A056080 Sum_{k=0..25} a(n)=A054976(5).
%F A056080 G.f. : Z(S_5 X S_5; x_1, x_2, ...)-2*Z(S_5 X S_4; x_1, x_2, ...)+Z(S_4 X S_4; x_1, x_2, ...) if we replace x_i by 1+x^i, where Z(S_i X S_j; x_1, x_2, ...) is cycle index of Cartesian product of symmetric groups S_i and S_j of degree i and j, respectively.
%Y A056080 Cf. A052371.
%K A056080 fini,full,nonn
%O A056080 5,2
%A A056080 _Vladeta Jovovic_, Aug 04 2000