cp's OEIS Frontend

A239813 Number of nX2 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it, modulo 4.

%I A239813 #6 Jun 02 2025 09:31:47
%S A239813 4,23,113,582,2981,15266,78188,400542,2051667,10509067,53831920,
%T A239813 275740995,1412438656,7234951864,37059718148,189831642853,
%U A239813 972377820507,4980827553280,25513377870835,130687610786192,669423377137934
%N A239813 Number of nX2 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it, modulo 4.
%C A239813 Column 2 of A239819
%H A239813 R. H. Hardin, <a href="/A239813/b239813.txt">Table of n, a(n) for n = 1..210</a>
%F A239813 Empirical: a(n) = a(n-1) +16*a(n-2) +31*a(n-3) -8*a(n-4) -78*a(n-5) -45*a(n-6) +56*a(n-7) -32*a(n-8) +32*a(n-9) +16*a(n-10)
%e A239813 Some solutions for n=5
%e A239813 ..2..0....2..0....2..0....3..2....3..2....3..0....3..0....3..2....2..3....2..0
%e A239813 ..1..3....2..3....2..3....3..2....3..2....1..2....2..0....1..0....2..3....1..0
%e A239813 ..3..2....3..1....3..1....2..3....1..0....2..0....1..3....3..2....2..0....3..0
%e A239813 ..1..3....1..0....3..2....3..2....1..2....1..2....1..2....3..2....1..2....1..3
%e A239813 ..2..3....3..0....1..2....1..3....2..0....1..0....1..3....2..1....2..0....1..3
%K A239813 nonn
%O A239813 1,1
%A A239813 _R. H. Hardin_, Mar 27 2014