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 A224034 #6 Jul 23 2025 04:55:18 %S A224034 5,19,58,168,488,1422,4160,12214,35960,106072,313246,925694,2736638, %T A224034 8092056,23930330,70772252,209309684,619043562,1830861726,5414905178, %U A224034 16014983408,47365507554,140087012360,414317718488,1225375238694 %N A224034 Number of nX4 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing. %C A224034 Column 4 of A224038 %H A224034 R. H. Hardin, <a href="/A224034/b224034.txt">Table of n, a(n) for n = 1..210</a> %F A224034 Empirical: a(n) = 5*a(n-1) -6*a(n-2) -a(n-3) +2*a(n-4) +2*a(n-5) -2*a(n-6) +4*a(n-7) %e A224034 Some solutions for n=3 %e A224034 ..1..1..1..1....0..0..1..1....0..0..0..0....0..0..0..1....0..0..0..0 %e A224034 ..1..1..1..1....0..1..1..1....1..1..1..1....0..0..0..1....0..1..1..1 %e A224034 ..0..1..1..1....0..1..1..1....1..1..1..1....0..0..0..0....0..0..1..1 %K A224034 nonn %O A224034 1,1 %A A224034 _R. H. Hardin_ Mar 30 2013