A251202 - OEIS

%I #5 Nov 30 2014 19:39:43

%S 40,1246,102811,27920380,29868134632,129855805888645,

%T 2203266860629332142,141756509654699247308602,

%U 34090982077422268972865847281,30409612013209091174685207093821492

%N Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock summing to a nonzero multiple of 2

%C Diagonal of A251210

%H R. H. Hardin, <a href="/A251202/b251202.txt">Table of n, a(n) for n = 1..11</a>

%e Some solutions for n=3

%e ..2..2..0..2....0..2..2..2....2..2..0..0....1..2..2..1....0..0..0..1

%e ..0..2..2..2....2..0..0..2....0..0..2..0....1..2..0..1....2..2..0..1

%e ..0..2..2..0....0..0..2..2....0..2..0..2....0..1..1..0....0..2..2..1

%e ..0..2..2..2....0..2..0..0....0..0..0..2....2..1..1..2....0..2..2..1

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 30 2014