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 A067214 #11 Dec 12 2023 19:47:24 %S A067214 1,7,49,5215,21841937,3430832678207,21070560836988719941, %T A067214 5258020825380244651432771257,54855616345977485934984671841940089233 %N A067214 Number of n X n 0..6 matrices with all row and column sums equal. %e A067214 Some solutions for n=3 %e A067214 ..4..0..6....5..4..4....1..2..4....5..5..2....5..0..4....6..3..0....2..6..2 %e A067214 ..3..5..2....6..4..3....0..5..2....1..5..6....0..6..3....0..6..3....3..4..3 %e A067214 ..3..5..2....2..5..6....6..0..1....6..2..4....4..3..2....3..0..6....5..0..5 %Y A067214 Column 6 of A202784. %K A067214 nonn,more %O A067214 0,2 %A A067214 _R. H. Hardin_, Feb 20 2002 %E A067214 a(0)=1 prepended and a(6)-a(7) from _Andrew Howroyd_, May 11 2020 %E A067214 a(8) from _Sean A. Irvine_, Dec 12 2023