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 A067219 #12 Oct 14 2024 10:55:27 %S A067219 1,12,144,75516,4641494832,31335724079805792, %T A067219 24293081804978470413606900 %N A067219 Number of n X n 0..11 matrices with all row and column sums equal. %Y A067219 Column k=11 of A202784. %K A067219 nonn,more %O A067219 0,2 %A A067219 _R. H. Hardin_, Feb 20 2002 %E A067219 a(5)-a(6) from _Sean A. Irvine_, Dec 11 2023 %E A067219 a(0)=1 prepended by _Andrew Howroyd_, Oct 14 2024