cp's OEIS Frontend

A231647 Number of nX4 0..2 arrays with no element less than a strict majority of its horizontal and vertical neighbors.

%I A231647 #6 Jul 23 2025 06:36:00
%S A231647 22,341,7682,137961,2412274,42882766,765163605,13643499478,
%T A231647 243317286312,4340128403053,77412117578960,1380680024126767,
%U A231647 24625023800964584,439200986311182069,7833405373009045177,139713294059336266128
%N A231647 Number of nX4 0..2 arrays with no element less than a strict majority of its horizontal and vertical neighbors.
%C A231647 Column 4 of A231651
%H A231647 R. H. Hardin, <a href="/A231647/b231647.txt">Table of n, a(n) for n = 1..210</a>
%e A231647 Some solutions for n=3
%e A231647 ..1..1..1..1....1..0..0..2....2..1..0..0....0..1..2..1....1..0..0..2
%e A231647 ..0..0..2..2....0..0..0..1....0..0..0..0....0..0..0..1....1..0..0..1
%e A231647 ..0..0..2..2....0..0..0..1....0..0..2..1....2..0..0..2....1..2..0..0
%K A231647 nonn
%O A231647 1,1
%A A231647 _R. H. Hardin_, Nov 12 2013