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 A333887 #4 Apr 08 2020 21:27:14 %S A333887 1,1,7,29,142,556,1919,5793,15758,39131,90185,194905,398773,777708, %T A333887 1454721,2622421,4575020,7750397,12787648,20600441,32473894,50185556, %U A333887 76161130,113665307,167041499,242001146,345981348,488570133,682023069,941871068,1287649789 %N A333887 Number of non-isomorphic 5 X 5 nonnegative integer symmetric matrices with all row and column sums equal to n up to permutations of rows and columns. %Y A333887 Row n=5 of A333737. %K A333887 nonn %O A333887 0,3 %A A333887 _Andrew Howroyd_, Apr 08 2020