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 A067215 #8 May 11 2020 19:22:55 %S A067215 1,8,64,10088,82112704,32701809796548,664942846307414508064, %T A067215 717494365786942428294915062416 %N A067215 Number of n X n 0..7 matrices with all row and column sums equal. %e A067215 Some solutions for n=3 %e A067215 ..5..6..2....6..7..4....6..0..4....5..2..1....3..2..5....2..1..5....4..7..5 %e A067215 ..3..4..6....6..4..7....0..4..6....3..4..1....4..1..5....5..2..1....7..2..7 %e A067215 ..5..3..5....5..6..6....4..6..0....0..2..6....3..7..0....1..5..2....5..7..4 %Y A067215 Column 7 of A202784. %K A067215 nonn %O A067215 0,2 %A A067215 _R. H. Hardin_, Feb 20 2002 %E A067215 a(0)=1 prepended and a(6)-a(7) from _Andrew Howroyd_, May 11 2020