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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 1
0, 1, 18, 386, 12200, 608993, 49489706, 6648891794, 1489334202216, 558938851118771, 352470525557050186, 374131713336300308700, 669158287926101914730400, 2017974751792892883550074600 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 20 12:33 EDT 2019. Contains 323422 sequences. (Running on oeis4.)