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 A172636 #7 May 09 2020 21:19:39 %S A172636 1,393,35617,7343449,1509893001,360255871641,91358224634433, %T A172636 24567498558526617,6887820148172502169,1998635481349606292593, %U A172636 596268326872362183077193,182062424087215419645579529 %N A172636 Number of n X 7 0..2 arrays with row sums 7 and column sums n. %H A172636 R. H. Hardin, <a href="/A172636/b172636.txt">Table of n, a(n) for n=1..47</a> %Y A172636 Column k=7 of A334549. %K A172636 nonn %O A172636 1,2 %A A172636 _R. H. Hardin_, Feb 06 2010