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Number of nX7 0..3 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero
1

%I #5 Aug 11 2014 22:45:55

%S 0,522,105962,31513702,8501873308,2336016267460,640923626812310,

%T 175842069555560942,48247633863197248500,13237975198745405063076,

%U 3632190801170643496264878,996587949883754866605651734

%N Number of nX7 0..3 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

%C Column 7 of A231285

%H R. H. Hardin, <a href="/A231284/b231284.txt">Table of n, a(n) for n = 1..200</a>

%H R. H. Hardin, <a href="/A231284/a231284.txt">Empirical recurrence of order 55</a>

%F Empirical recurrence of order 55 (see link above)

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 06 2013