A252977 Number of n X n nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value increasing by 0 or 1 with every step right, diagonally se or down

0, 0, 1, 68, 4657, 432842, 60650883, 13458882036, 4857082197177, 2895119784219358, 2877300288177184239, 4796057029604523514392, 13457301734652492685623300, 63707500883584152928303777296

Offset

1,4

Comments

Diagonal of A252983

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

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

Crossrefs

Sequence in context: A159361 A004298 A223226 * A265243 A331867 A267064

Adjacent sequences: A252974 A252975 A252976 * A252978 A252979 A252980

Keyword

nonn

Author

R. H. Hardin, Dec 25 2014

Status

approved