cp's OEIS Frontend

A239997 Number of nX4 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

%I A239997 #6 Jun 02 2025 09:37:03
%S A239997 5,42,526,6527,86360,1225281,18392485,290513038,4767970186,
%T A239997 80410934960,1381071762609,24002339457710,420292066661594,
%U A239997 7394152265405038,130463578696387397,2306049013760669647,40806118077181581732
%N A239997 Number of nX4 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.
%C A239997 Column 4 of A240000
%H A239997 R. H. Hardin, <a href="/A239997/b239997.txt">Table of n, a(n) for n = 1..210</a>
%e A239997 Some solutions for n=4
%e A239997 ..0..3..3..0....0..0..3..3....0..3..3..0....0..0..3..3....0..0..0..3
%e A239997 ..0..2..2..3....3..3..2..2....0..0..2..1....3..3..2..2....3..3..0..0
%e A239997 ..0..2..0..0....3..2..1..0....3..3..0..1....0..2..2..2....3..2..3..2
%e A239997 ..3..3..2..0....3..1..3..2....3..3..1..3....3..2..3..3....2..1..3..1
%K A239997 nonn
%O A239997 1,1
%A A239997 _R. H. Hardin_, Mar 30 2014