cp's OEIS Frontend

A239860 Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

%I A239860 #6 Jun 02 2025 09:35:14
%S A239860 4,5,44,78,255,742,1382,5647,14755,33946,120389,305123,717503,2451925,
%T A239860 6276842,15461619,51283453,130329061,331984698,1067700153,2718467454,
%U A239860 7099921104,22241389875,56803646347,151320850227,463374925294
%N A239860 Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.
%C A239860 Row 3 of A239858
%H A239860 R. H. Hardin, <a href="/A239860/b239860.txt">Table of n, a(n) for n = 1..174</a>
%e A239860 Some solutions for n=4
%e A239860 ..3..2..3..2....3..2..3..2....3..2..3..2....3..2..3..3....3..2..3..3
%e A239860 ..2..1..1..3....2..1..1..3....2..1..2..3....2..1..2..2....2..1..2..2
%e A239860 ..2..1..2..3....3..1..3..2....3..2..2..2....3..0..2..3....2..0..0..3
%K A239860 nonn
%O A239860 1,1
%A A239860 _R. H. Hardin_, Mar 28 2014