cp's OEIS Frontend

A240155 Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

%I A240155 #6 Jun 02 2025 09:40:59
%S A240155 4,11,20,107,186,450,1641,2788,8018,23175,45126,134673,357608,737260,
%T A240155 2166386,5505921,11966760,34560626,85121623,194751022,548083132,
%U A240155 1325791556,3156785846,8660504920,20790818391,50929828270,136560783094
%N A240155 Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.
%C A240155 Row 3 of A240153
%H A240155 R. H. Hardin, <a href="/A240155/b240155.txt">Table of n, a(n) for n = 1..184</a>
%e A240155 Some solutions for n=4
%e A240155 ..2..2..3..2....2..2..3..3....3..3..2..3....2..2..3..2....3..2..3..3
%e A240155 ..0..2..1..1....0..2..1..1....2..1..2..1....0..2..1..1....3..2..1..2
%e A240155 ..0..0..3..3....2..2..3..2....0..0..3..3....0..0..0..3....2..2..3..3
%K A240155 nonn
%O A240155 1,1
%A A240155 _R. H. Hardin_, Apr 02 2014