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 A067217 #11 Oct 14 2024 10:55:38 %S A067217 1,10,100,30502,754898668,1426274971770170,214919363287707751206910, %T A067217 2685049440186600182381381075290270 %N A067217 Number of n X n 0..9 matrices with all row and column sums equal. %Y A067217 Column k=9 of A202784. %K A067217 nonn,more %O A067217 0,2 %A A067217 _R. H. Hardin_, Feb 20 2002 %E A067217 a(5)-a(7) from _Sean A. Irvine_, Dec 12 2023 %E A067217 a(0)=1 prepended by _Andrew Howroyd_, Oct 14 2024