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 A223825 #7 Jul 23 2025 04:34:25 %S A223825 3,81,6166,738482,111026387,18986502099,3529435151262,698068937559304 %N A223825 Number of n X n 0..2 arrays with rows and columns unimodal. %C A223825 Diagonal of A223831 %e A223825 Some solutions for n=3 %e A223825 ..0..2..2....0..1..1....1..2..1....1..1..2....1..2..0....1..2..1....0..2..0 %e A223825 ..0..0..0....0..1..1....2..2..2....2..1..0....0..2..2....0..0..0....2..2..0 %e A223825 ..1..0..0....0..2..1....0..0..0....2..2..0....0..1..1....0..0..0....1..1..1 %K A223825 nonn %O A223825 1,1 %A A223825 _R. H. Hardin_ Mar 27 2013