login
Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock sum differing from its neighbors horizontally, vertically, diagonally and antidiagonally
1

%I #4 Dec 29 2014 19:16:00

%S 26784,167832,1029888,8153960,61286116,465921688,3524494796,

%T 26879615668,204459584768,1560668372324,11882769388376,90517446353584,

%U 689680753666852,5257319067276484,40057456786744360,305206750112569024

%N Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock sum differing from its neighbors horizontally, vertically, diagonally and antidiagonally

%C Column 4 of A253294

%H R. H. Hardin, <a href="/A253292/b253292.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 29 2014