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 A223974 #6 Jul 23 2025 04:44:06 %S A223974 239,57121,7829639,822895397,76942621022,6766457318128, %T A223974 574360426081996,47758165568891552,3923597116646870013, %U A223974 320103299171867245506,26009282573098001541721,2108303995165038876541532 %N A223974 Number of nX7 0..2 arrays with rows and antidiagonals unimodal. %C A223974 Column 7 of A223975 %H A223974 R. H. Hardin, <a href="/A223974/b223974.txt">Table of n, a(n) for n = 1..210</a> %e A223974 Some solutions for n=3 %e A223974 ..0..0..0..2..2..2..2....0..0..0..2..0..0..0....0..0..0..0..0..2..1 %e A223974 ..0..0..0..1..2..2..0....0..0..0..0..0..1..2....0..0..0..0..2..2..0 %e A223974 ..0..0..0..0..0..2..2....0..0..0..1..2..0..0....0..0..2..2..2..0..0 %K A223974 nonn %O A223974 1,1 %A A223974 _R. H. Hardin_ Mar 30 2013