cp's OEIS Frontend

A240280 Number of nX3 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 zero plus the sum of the elements diagonally to its northwest, modulo 4.

%I A240280 #6 Jun 02 2025 09:46:18
%S A240280 2,19,80,262,1461,5443,24490,117962,459193,2147788,9481211,39404594,
%T A240280 181740410,780110007,3374455576,15188622683,65126163196,286616870440,
%U A240280 1266986470030,5476212217332,24183642014347,105926526183355
%N A240280 Number of nX3 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 zero plus the sum of the elements diagonally to its northwest, modulo 4.
%C A240280 Column 3 of A240284
%H A240280 R. H. Hardin, <a href="/A240280/b240280.txt">Table of n, a(n) for n = 1..210</a>
%e A240280 Some solutions for n=4
%e A240280 ..3..3..1....3..1..3....3..3..1....3..1..3....3..3..1....3..3..1....3..1..3
%e A240280 ..3..2..1....2..1..2....2..2..2....3..1..2....2..2..0....2..0..0....3..1..0
%e A240280 ..3..1..2....2..1..1....2..1..2....2..1..1....2..1..2....2..0..1....2..1..2
%e A240280 ..2..1..3....3..3..1....3..3..0....3..3..2....3..1..0....3..3..1....3..3..1
%K A240280 nonn
%O A240280 1,1
%A A240280 _R. H. Hardin_, Apr 03 2014