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 A223799 #6 Jul 23 2025 04:32:04 %S A223799 610,372100,131295500,37217420249,9658691177678,2401987689157097, %T A223799 584566278788358762,140706704179577280652,33682261034207872011248, %U A223799 8040572062005220287891916,1916764185795334806820505504 %N A223799 Number of nX6 0..3 arrays with rows and antidiagonals unimodal. %C A223799 Column 6 of A223801 %H A223799 R. H. Hardin, <a href="/A223799/b223799.txt">Table of n, a(n) for n = 1..210</a> %e A223799 Some solutions for n=3 %e A223799 ..0..0..0..0..2..0....0..0..0..1..2..1....0..0..0..0..3..3....0..0..0..1..1..1 %e A223799 ..0..0..0..3..0..0....0..0..0..2..3..2....0..0..0..2..2..0....0..0..0..2..2..0 %e A223799 ..0..0..1..3..2..2....0..0..0..0..2..1....0..0..0..1..1..0....0..0..0..1..2..3 %K A223799 nonn %O A223799 1,1 %A A223799 _R. H. Hardin_ Mar 27 2013