cp's OEIS Frontend

A222873 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A222873 #6 Jul 23 2025 03:11:23
%S A222873 2,122,6282,443510,23794078,1698174722,93656293632,6637413406814,
%T A222873 372075279639542,26219034320665058,1485998820062892388,
%U A222873 104217650825897197592,5955892893018468638926,416011416350266218862952
%N A222873 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A222873 Column 3 of A222878
%H A222873 R. H. Hardin, <a href="/A222873/b222873.txt">Table of n, a(n) for n = 1..210</a>
%e A222873 Some solutions for n=3
%e A222873 ..0..1..0....0..1..2....0..0..0....0..1..0....0..0..1....0..1..0....0..1..1
%e A222873 ..2..1..0....1..3..0....1..2..3....0..2..0....1..2..2....0..2..1....1..2..1
%e A222873 ..2..2..1....0..2..3....3..0..3....1..1..3....0..3..2....1..0..2....0..3..0
%K A222873 nonn
%O A222873 1,1
%A A222873 _R. H. Hardin_ Mar 08 2013