cp's OEIS Frontend

A223042 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A223042 #6 Jul 23 2025 03:25:07
%S A223042 2,8,98,1265,17356,241583,3395532,48048796,683306658,9759462283,
%T A223042 139866408792,2010279482902,28963821801648,418182844095108,
%U A223042 6048773850787538,87632133398349504,1271377018275506438
%N A223042 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A223042 Row 2 of A223041
%H A223042 R. H. Hardin, <a href="/A223042/b223042.txt">Table of n, a(n) for n = 1..61</a>
%e A223042 Some solutions for n=3
%e A223042 ..0..1..1....0..1..2....0..0..0....0..1..2....0..0..1....0..1..2....0..1..2
%e A223042 ..2..1..0....0..3..2....1..2..1....3..3..3....0..2..1....3..1..1....0..0..3
%K A223042 nonn
%O A223042 1,1
%A A223042 _R. H. Hardin_ Mar 12 2013