cp's OEIS Frontend

A222567 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

%I A222567 #7 Jul 23 2025 02:46:04
%S A222567 1,1,5,18,59,200,820,3014,11364,42748,164652,627034,2399454,9229494,
%T A222567 35487202,137093302,528389870,2048668614,7920616338,30777407006,
%U A222567 119302534874,464420087686,1804371752146,7034061387558,27382292281570
%N A222567 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
%C A222567 Column 2 of A222573
%H A222567 R. H. Hardin, <a href="/A222567/b222567.txt">Table of n, a(n) for n = 1..210</a>
%e A222567 All solutions for n=3
%e A222567 ..0..0....0..0....0..0....0..1....0..1
%e A222567 ..0..0....0..0....0..0....1..1....0..0
%e A222567 ..0..0....1..0....0..1....1..1....0..0
%K A222567 nonn
%O A222567 1,3
%A A222567 _R. H. Hardin_ Feb 25 2013