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 A058391 #12 Sep 07 2018 11:49:10 %S A058391 1,7,198,5929,145168,2459994,30170387,282159907,2114430613, %T A058391 13190940964,70598379694,331820068035,1395291176641,5327752138987, %U A058391 18698405435444,60922707883197,185814239933254,534246250634068,1456622823771075 %N A058391 Number of 5 X 5 matrices with nonnegative integer entries and all row sums equal to n, up to row and column permutation. %H A058391 Andrew Howroyd, <a href="/A058391/b058391.txt">Table of n, a(n) for n = 0..1000</a> %H A058391 V. Jovovic, <a href="/A058389/a058389a.pdf">Number of m x m nonnegative integer matrices with all row sums equal to n, up to row and column permutation.</a> %o A058391 (PARI) \\ See A318951 for RowSumMats %o A058391 a(n)=RowSumMats(5, 5, n); \\ _Andrew Howroyd_, Sep 05 2018 %Y A058391 Row 5 of A318951. %Y A058391 Cf. A002620, A058389, A058390, A058392, A003438. %K A058391 nonn %O A058391 0,2 %A A058391 _Vladeta Jovovic_, Nov 24 2000