A230909 - OEIS

A230909

Number of nX7 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero

%I #4 Nov 01 2013 07:08:43

%S 0,882,11324,130178,1603356,20713786,271505344,3573938648,47146678686,

%T 622659105328,8227931798990,108754213190144,1437675672142318,

%U 19006711444189020,251286474365447448,3322305731095306986

%N Number of nX7 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero

%C Column 7 of A230910

%H R. H. Hardin, <a href="/A230909/b230909.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..0..1..2..0..1..3..2....0..3..0..3..1..0..1....0..3..0..2..3..0..2

%e ..3..0..3..2..0..1..0....1..2..1..0..2..3..2....1..2..1..0..1..3..0

%e ..2..1..0..3..2..3..2....3..0..3..1..0..1..0....3..0..3..2..0..1..2

%e ..0..3..2..0..1..0..1....2..1..0..3..2..3..2....2..1..0..1..3..0..3

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 01 2013