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 A067216 #11 Oct 14 2024 10:55:42 %S A067216 1,9,81,18081,264639729,239657412990669,14022194613733384575957, %T A067216 55099298574634623527360069025765 %N A067216 Number of n X n 0..8 matrices with all row and column sums equal. %Y A067216 Column k=8 of A202784. %K A067216 nonn,more %O A067216 0,2 %A A067216 _R. H. Hardin_, Feb 20 2002 %E A067216 a(5)-a(7) from _Sean A. Irvine_, Dec 12 2023 %E A067216 a(0)=1 prepended by _Andrew Howroyd_, Oct 14 2024