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 A224372 #6 Jul 23 2025 05:07:37 %S A224372 148,4690,80819,1092281,13831334,174854516,2231009824,28645726612, %T A224372 368818252942,4752723627808,61255849072312,789494767364269, %U A224372 10175118017926314,131136401564099516,1690070260377561269 %N A224372 Number of nX6 0..2 arrays with rows unimodal and antidiagonals nondecreasing. %C A224372 Column 6 of A224374 %H A224372 R. H. Hardin, <a href="/A224372/b224372.txt">Table of n, a(n) for n = 1..210</a> %F A224372 Empirical: a(n) = 28*a(n-1) -283*a(n-2) +1386*a(n-3) -3562*a(n-4) +4940*a(n-5) -3840*a(n-6) -14256*a(n-7) +50007*a(n-8) -26386*a(n-9) +141154*a(n-10) +250789*a(n-11) +41356*a(n-12) +274344*a(n-13) +134400*a(n-14) for n>18 %e A224372 Some solutions for n=3 %e A224372 ..0..0..0..1..2..1....0..1..1..1..1..1....0..0..0..0..1..2....0..2..0..0..0..0 %e A224372 ..2..2..2..2..1..0....2..1..1..1..1..1....1..1..1..2..2..1....2..1..1..0..0..0 %e A224372 ..2..2..2..2..2..2....1..1..2..2..1..1....1..1..2..2..2..2....1..1..0..0..0..0 %K A224372 nonn %O A224372 1,1 %A A224372 _R. H. Hardin_ Apr 05 2013