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A208584
Number of 4Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors
0
15, 3233, 3012383, 7289707650, 35787552851324, 309603034324088207
OFFSET
1,1
COMMENTS
Row 4 of A208581
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
..1..1..1..0....1..1..1..2....1..1..1..1....1..1..1..0....1..1..1..0
..2..0..1..2....2..0..0..0....0..2..2..0....0..2..1..0....0..0..1..0
..0..1..0..0....0..1..1..0....0..0..1..0....0..0..3..1....1..0..1..0
CROSSREFS
Sequence in context: A232455 A208579 A080691 * A211903 A278630 A161584
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 29 2012
STATUS
approved