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 A223998 #8 Jul 23 2025 04:48:55 %S A223998 36,736,8291,71061,559188,4368458,34534687,276286000,2229871293, %T A223998 18115082917,147889219961,1211856739505,9958518859510,82010005661441, %U A223998 676451232895869,5586333937854878,46174727441274521,381916881456838766 %N A223998 Number of nX7 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing. %C A223998 Column 7 of A223999 %H A223998 R. H. Hardin, <a href="/A223998/b223998.txt">Table of n, a(n) for n = 1..210</a> %H A223998 R. H. Hardin, <a href="/A223998/a223998.txt">Empirical recurrence of order 54</a> %F A223998 Empirical recurrence of order 54 (see link above) %e A223998 Some solutions for n=3 %e A223998 ..0..0..0..0..0..1..1....0..1..1..1..1..1..1....0..0..0..0..1..1..1 %e A223998 ..0..0..0..0..1..1..2....0..0..1..1..1..1..2....0..1..1..1..1..2..2 %e A223998 ..1..1..1..2..2..2..2....0..0..1..1..1..2..2....0..0..1..1..1..1..2 %K A223998 nonn %O A223998 1,1 %A A223998 _R. H. Hardin_ Mar 30 2013