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 A067218 #12 Oct 14 2024 10:55:35 %S A067218 1,11,121,48983,1950230969,7169135482380621,2543060905110036322914145, %T A067218 90495116991790689711315590295804971 %N A067218 Number of n X n 0..10 matrices with all row and column sums equal. %Y A067218 Column k=10 of A202784. %K A067218 nonn,more %O A067218 0,2 %A A067218 _R. H. Hardin_, Feb 20 2002 %E A067218 a(5)-a(7) from _Sean A. Irvine_, Dec 12 2023 %E A067218 a(0)=1 prepended by _Andrew Howroyd_, Oct 14 2024