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A230903
Number of n X n 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
0
0, 2, 38, 802, 30304, 2121666, 271505344, 63341237848, 26993178279216
OFFSET
1,2
COMMENTS
Diagonal of A230910
EXAMPLE
Some solutions for n=4
..0..2..0..3....0..3..1..3....0..2..1..3....0..1..2..1....0..1..0..1
..1..3..1..0....1..2..0..1....1..3..0..1....3..0..3..0....2..3..2..0
..0..2..3..2....3..1..3..2....2..1..2..0....1..2..1..2....0..1..3..2
..1..0..1..0....0..2..1..0....0..3..1..3....3..0..3..1....3..2..1..0
CROSSREFS
Sequence in context: A262585 A208240 A075796 * A246000 A266601 A266597
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 01 2013
STATUS
approved