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 A172640 #7 May 09 2020 21:20:29 %S A172640 1,73789,358198369,8365213132981,185658731463324901, %T A172640 5520471267708881730181,182062424087215419645579529, %U A172640 6705797924085107855686463036869,266324891937340036349722115366403541 %N A172640 Number of n X 12 0..2 arrays with row sums 12 and column sums n. %H A172640 R. H. Hardin, <a href="/A172640/b172640.txt">Table of n, a(n) for n=1..18</a> %Y A172640 Column k=12 of A334549. %K A172640 nonn %O A172640 1,2 %A A172640 _R. H. Hardin_, Feb 06 2010