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 A172919 #10 Apr 27 2015 11:25:37 %S A172919 1,1,8,666,381424,976395820,8575979362560,215717608046511873, %T A172919 13590707419428422843904,1933216160887575268614599040, %U A172919 571506744082785127089569166384000 %N A172919 Number of n X n 0..7 arrays with row sums 7 and column sums 7. %H A172919 R. H. Hardin, <a href="/A172919/b172919.txt">Table of n, a(n) for n = 0..20</a> %Y A172919 Column k=7 of A257493. %K A172919 nonn %O A172919 0,3 %A A172919 _R. H. Hardin_, Feb 06 2010