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 A172904 #8 Apr 18 2020 22:25:39 %S A172904 1,141,28681,7100821,1985311701,602351808741,193953937375521, %T A172904 65338547748658101,22800663583664571781,8184214105554904614241, %U A172904 3006271871518328730143421,1125711921752126203903372141 %N A172904 Number of n X 6 0..6 arrays with row sums 6 and column sums n. %H A172904 R. H. Hardin, <a href="/A172904/b172904.txt">Table of n, a(n) for n=1..61</a> %Y A172904 Column k=6 of A333901. %K A172904 nonn %O A172904 1,2 %A A172904 _R. H. Hardin_, Feb 06 2010