A208582 Number of 2Xn 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

2, 12, 152, 3024, 84124, 3057664, 139056380, 7675358704, 502604958608, 38359095933912, 3363791582993716, 334974400169588800, 37509570331200251508, 4683620100177290725336, 647429265450114057846496

Offset

1,1

Comments

Row 2 of A208581

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

Some solutions for n=4
..0..0..0..0....0..0..1..0....0..0..1..1....0..0..0..1....0..0..0..0
..1..1..2..0....1..2..0..1....1..2..0..0....1..1..0..2....1..1..1..0

Crossrefs

Sequence in context: A126345 A229558 A362694 * A000795 A085628 A177777

Adjacent sequences: A208579 A208580 A208581 * A208583 A208584 A208585

Keyword

nonn

Author

R. H. Hardin Feb 29 2012

Status

approved