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 A224010 #6 Jul 23 2025 04:50:50 %S A224010 28,784,15340,245055,3516324,47735665,630339756,8213689391, %T A224010 106375878027,1373916879120,17723771318006,228519337975633, %U A224010 2945698436819118,37967141667302902,489335430219899681,6306607945054850639 %N A224010 Number of nX6 0..2 arrays with rows nondecreasing and antidiagonals unimodal. %C A224010 Column 6 of A224012 %H A224010 R. H. Hardin, <a href="/A224010/b224010.txt">Table of n, a(n) for n = 1..210</a> %F A224010 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) %e A224010 Some solutions for n=3 %e A224010 ..0..0..0..0..0..2....2..2..2..2..2..2....0..0..0..2..2..2....1..1..2..2..2..2 %e A224010 ..1..1..1..1..2..2....0..0..1..2..2..2....0..1..2..2..2..2....1..1..1..2..2..2 %e A224010 ..0..1..2..2..2..2....0..1..1..1..1..2....2..2..2..2..2..2....0..0..0..1..1..2 %K A224010 nonn %O A224010 1,1 %A A224010 _R. H. Hardin_ Mar 30 2013