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 A223614 #7 Jul 23 2025 04:17:37 %S A223614 2,16,240,4466,89630,1856100,39162020,840122330,18350758538, %T A223614 409124396540,9333564282142,218396645933584,5252293916506694 %N A223614 Number of n X n 0..1 arrays with rows and columns unimodal. %C A223614 Diagonal of A223620 %e A223614 Some solutions for n=4 %e A223614 ..1..1..0..0....0..1..0..0....0..0..0..0....1..0..0..0....0..1..1..0 %e A223614 ..1..1..0..0....1..1..0..0....0..1..0..0....1..1..0..0....0..1..1..0 %e A223614 ..1..1..0..0....0..1..0..0....0..1..1..0....1..1..1..1....0..1..1..0 %e A223614 ..0..0..0..1....0..0..1..1....0..1..1..0....1..1..1..0....0..1..1..1 %K A223614 nonn %O A223614 1,1 %A A223614 _R. H. Hardin_ Mar 24 2013