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A230784
Number of nX4 0..3 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero
1
0, 820, 117372, 14875702, 1986882996, 265749521034, 35493529463278, 4740947736896364, 633274321865930072, 84589617891954381282, 11299056033900192621348, 1509271228479641269394190
OFFSET
1,2
COMMENTS
Column 4 of A230787
FORMULA
Empirical recurrence of order 67 (see link above)
EXAMPLE
Some solutions for n=3
..0..0..3..2....0..1..2..3....0..1..3..2....0..2..1..0....0..1..3..0
..0..1..2..0....1..2..2..0....2..0..3..2....1..3..0..3....1..2..2..1
..3..3..0..1....3..0..0..1....3..2..1..2....1..2..2..1....0..1..0..3
CROSSREFS
Sequence in context: A043460 A038489 A210150 * A022254 A095964 A342064
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 30 2013
STATUS
approved