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A208469
Number of 4Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors
0
15, 4140, 4150760, 10318694804, 50996571454200, 440379403449903222, 6092197983646590702604
OFFSET
1,1
COMMENTS
Row 4 of A208466
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..1..2..0....0..1..0..2....1..2..0..0....1..0..1..1....0..1..0..0
..0..0..0..0....1..0..0..0....0..0..1..0....0..1..2..0....0..0..1..0
..1..0..1..2....0..1..0..2....0..0..0..0....0..0..0..0....0..0..0..0
CROSSREFS
Sequence in context: A172322 A139297 A211251 * A070907 A208053 A361453
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 27 2012
STATUS
approved