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 A067223 #14 Oct 14 2024 10:56:04 %S A067223 1,16,256,316624,81851507456,4128449284755670956, %T A067223 42503886964244001261643010752 %N A067223 Number of n X n 0..15 matrices with all row and column sums equal. %Y A067223 Column k=15 of A202784. %K A067223 nonn,more %O A067223 0,2 %A A067223 _R. H. Hardin_, Feb 20 2002 %E A067223 a(5)-a(6) from _Sean A. Irvine_, Dec 10 2023 %E A067223 a(0)=1 prepended by _Andrew Howroyd_, Oct 14 2024