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 A224307 #7 Jul 23 2025 05:05:22 %S A224307 86,1915,20214,164514,1258372,9829605,80083648,677557164,5882182248, %T A224307 51821072499,459888653374,4094603418389,36504683598749, %U A224307 325625769512292,2905345619322972,25926555852863165,231390081746732292 %N A224307 Number of nX5 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing. %C A224307 Column 5 of A224310 %H A224307 R. H. Hardin, <a href="/A224307/b224307.txt">Table of n, a(n) for n = 1..210</a> %H A224307 R. H. Hardin, <a href="/A224307/a224307.txt">Empirical recurrence of order 61</a> %F A224307 Empirical recurrence of order 61 (see link above) %e A224307 Some solutions for n=3 %e A224307 ..0..0..2..1..0....0..0..1..1..1....0..0..0..1..1....0..1..1..0..0 %e A224307 ..0..2..2..2..1....0..1..1..1..1....0..0..1..2..1....1..2..2..1..0 %e A224307 ..2..2..2..2..1....1..2..1..1..0....1..2..2..1..0....2..2..1..1..1 %K A224307 nonn %O A224307 1,1 %A A224307 _R. H. Hardin_ Apr 03 2013