cp's OEIS Frontend

A240761 Number of 2Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or zero 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 A240761 #6 Jun 02 2025 09:59:40
%S A240761 2,6,9,42,124,474,1440,5239,16730,58945,192711,666682,2209028,7562090,
%T A240761 25254050,85922148,288250557,977287148,3287088851,11122488393,
%U A240761 37465304475,126628657804,426895509278,1441942470916,4863435928395
%N A240761 Number of 2Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or zero 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 A240761 Row 2 of A240760
%H A240761 R. H. Hardin, <a href="/A240761/b240761.txt">Table of n, a(n) for n = 1..84</a>
%e A240761 Some solutions for n=4
%e A240761 ..3..1..3..3....2..2..2..2....2..2..3..3....2..2..2..2....3..3..2..3
%e A240761 ..2..2..2..1....3..1..0..3....3..1..0..2....3..3..1..3....2..0..0..1
%K A240761 nonn
%O A240761 1,1
%A A240761 _R. H. Hardin_, Apr 12 2014