A208781 Number of n X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any antidiagonal neighbor (colorings ignoring permutations of colors)

1, 10, 9089, 3038188519, 955922762706415420, 584640904301741699504623887947

Offset

1,2

Comments

Diagonal of A208788

Links

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

Example

Some solutions for n=4
..0..1..0..0....0..0..1..2....0..0..0..0....0..0..0..0....0..0..1..2
..0..1..1..1....1..0..0..0....1..2..1..0....1..1..1..0....1..0..0..0
..0..2..0..0....1..1..1..0....3..0..1..0....0..2..1..0....1..1..1..0
..0..1..1..0....0..2..1..0....1..0..1..0....0..0..1..0....2..0..1..0

Crossrefs

Sequence in context: A291562 A203589 A109893 * A125544 A137641 A137642

Adjacent sequences: A208778 A208779 A208780 * A208782 A208783 A208784

Keyword

nonn

Author

R. H. Hardin Mar 01 2012

Status

approved