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 A223741 #5 Jul 23 2025 04:26:47 %S A223741 239,57121,4207089,129982953,2289596121,28017383049,268717054875, %T A223741 2171612995939,15433289999394,98940871306124,581277319267903, %U A223741 3162355311990371,16049547130078535 %N A223741 Number of nX7 0..2 arrays with rows, columns, diagonals and antidiagonals unimodal. %C A223741 Column 7 of A223742 %e A223741 Some solutions for n=3 %e A223741 ..0..0..0..0..1..1..0....0..0..0..1..1..1..2....0..0..0..0..0..2..0 %e A223741 ..0..0..1..2..2..2..1....0..0..0..1..1..2..0....0..0..0..0..2..2..0 %e A223741 ..0..0..0..2..2..2..0....0..0..0..1..1..1..0....0..0..0..0..1..0..0 %K A223741 nonn %O A223741 1,1 %A A223741 _R. H. Hardin_ Mar 26 2013