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 A224187 #6 Jul 23 2025 05:01:54 %S A224187 86,1600,14751,89380,408222,1519738,4844576,13669953,34953776, %T A224187 82399174,181434331,376946128,744873156,1409068188,2565196232, %U A224187 4513845865,7705502706,12800568660,20748212991,32888515396,51083111090,77880377510 %N A224187 Number of nX5 0..2 arrays with rows unimodal and columns nondecreasing. %C A224187 Column 5 of A224190 %H A224187 R. H. Hardin, <a href="/A224187/b224187.txt">Table of n, a(n) for n = 1..210</a> %F A224187 Empirical: a(n) = (1009/907200)*n^10 + (913/36288)*n^9 + (15121/60480)*n^8 + (8677/6048)*n^7 + (226987/43200)*n^6 + (110621/8640)*n^5 + (3804217/181440)*n^4 + (206081/9072)*n^3 + (130433/8400)*n^2 + (3793/630)*n + 1 %e A224187 Some solutions for n=3 %e A224187 ..0..1..0..0..0....0..1..2..1..1....0..0..1..1..1....0..1..2..1..1 %e A224187 ..0..1..1..0..0....0..1..2..1..1....0..2..2..1..1....2..2..2..2..1 %e A224187 ..1..2..2..2..2....0..1..2..2..2....0..2..2..1..1....2..2..2..2..1 %K A224187 nonn %O A224187 1,1 %A A224187 _R. H. Hardin_ Apr 01 2013