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

15, 3233, 3012383, 7289707650, 35787552851324, 309603034324088207

Offset

1,1

Comments

Row 4 of A208581

Links

Table of n, a(n) for n=1..6.

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

Adjacent sequences: A208581 A208582 A208583 * A208585 A208586 A208587

Keyword

nonn

Author

R. H. Hardin Feb 29 2012

Status

approved