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 A203562 #8 Apr 25 2024 13:26:16 %S A203562 3,183,10833,513903,39612503,8459809773,360255871643,37057831534783, %T A203562 4131064166006823,431284911997558083,48321459222257750543 %N A203562 Number of n X 6 0..2 arrays with row sums equal and column sums equal. %e A203562 Some solutions for n=5: %e A203562 ..2..1..0..2..1..0....2..0..2..2..0..0....0..2..1..0..2..1....1..2..1..1..0..1 %e A203562 ..0..1..0..2..2..1....2..0..0..1..2..1....1..0..1..1..1..2....1..2..2..1..0..0 %e A203562 ..0..0..1..1..2..2....1..1..2..0..0..2....2..2..2..0..0..0....1..1..1..1..1..1 %e A203562 ..1..1..2..0..0..2....0..2..0..0..2..2....1..0..0..2..2..1....1..0..1..1..2..1 %e A203562 ..2..2..2..0..0..0....0..2..1..2..1..0....1..1..1..2..0..1....1..0..0..1..2..2 %Y A203562 Column 6 of A203564. %K A203562 nonn,more %O A203562 1,1 %A A203562 _R. H. Hardin_, Jan 03 2012