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 A223617 #6 May 20 2021 14:43:18 %S A223617 16,256,2582,17594,89630,367216,1271969,3857481,10504174,26169386, %T A223617 60506898,131289614,269716032,528358366,992720569,1797620937, %U A223617 3149899316,5359276060,8879561670,14362835354,22729680458,35259087700,53702216265 %N A223617 Number of n X 5 0..1 arrays with rows and columns unimodal. %C A223617 Column 5 of A223620. %H A223617 R. H. Hardin, <a href="/A223617/b223617.txt">Table of n, a(n) for n = 1..210</a> %F A223617 Empirical: a(n) = (359/453600)*n^10 + (251/30240)*n^9 + (3817/60480)*n^8 + (73/280)*n^7 + (1127/1350)*n^6 + (485/288)*n^5 + (532219/181440)*n^4 + (25699/7560)*n^3 + (30811/8400)*n^2 + (451/210)*n + 1. %e A223617 Some solutions for n=4 %e A223617 ..1..1..1..1..1....1..1..1..0..0....1..1..0..0..0....0..1..1..1..1 %e A223617 ..0..1..1..1..1....0..1..1..1..0....0..0..0..1..0....0..1..1..1..0 %e A223617 ..0..0..0..0..0....0..0..1..1..0....0..0..0..1..1....1..1..1..0..0 %e A223617 ..0..0..0..0..0....0..0..0..0..0....0..0..1..1..1....1..1..1..0..0 %Y A223617 Cf. A223620. %K A223617 nonn %O A223617 1,1 %A A223617 _R. H. Hardin_ Mar 24 2013