A252888 Number of n X n nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 1 and every value increasing by 0 or 1 with every step right, diagonally se or down

0, 1, 18, 386, 12200, 608993, 49489706, 6648891794, 1489334202216, 558938851118771, 352470525557050186, 374131713336300308700, 669158287926101914730400, 2017974751792892883550074600

Offset

1,3

Comments

Diagonal of A252889

Links

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

Example

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

Crossrefs

Sequence in context: A285400 A324431 A070943 * A159647 A111454 A116421

Adjacent sequences: A252885 A252886 A252887 * A252889 A252890 A252891

Keyword

nonn

Author

R. H. Hardin, Dec 24 2014

Status

approved