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A230172
Number of nX4 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value 2-x(i,j)
1
9, 1407, 78849, 4722977, 284444079, 17072965263, 1027868078181, 61861526624839, 3721702070420191, 223920929460093089, 13473042937456532657, 810647385075641076549, 48774886700839338028985, 2934683063063203660000047
OFFSET
1,1
COMMENTS
Column 4 of A230176
FORMULA
Empirical recurrence of order 81 (see link above)
EXAMPLE
Some solutions for n=3
..2..0..1..1....0..2..2..0....2..1..0..2....0..0..0..2....0..0..0..2
..2..0..2..2....1..1..2..0....2..0..1..0....2..1..1..0....0..2..2..0
..0..2..0..0....1..0..0..0....0..1..2..0....0..0..0..2....2..2..0..0
CROSSREFS
Sequence in context: A270067 A213448 A120347 * A231191 A217267 A300594
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 11 2013
STATUS
approved