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A252931 Number of n X n nonnegative integer arrays with upper left 0 and every value within 3 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down 1
1, 5, 44, 711, 17962, 578342, 21312696, 857248091, 36723156004, 1650365159314, 77015673357558, 3704833216794534, 182732875391479366, 9203662331845611018, 471886132793225715184, 24568007717042452684419, 1296265434331412271116602 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A252938

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..24

EXAMPLE

Some solutions for n=4

..0..0..1..1....0..0..1..1....0..0..1..1....0..0..1..1....0..0..1..1

..1..1..1..1....0..1..1..2....0..0..1..2....1..1..1..2....1..1..1..2

..1..1..1..1....0..1..2..2....0..1..1..2....2..2..2..2....2..2..2..2

..2..2..2..2....1..1..2..3....0..1..2..2....2..2..2..2....2..2..2..3

CROSSREFS

Sequence in context: A052803 A201923 A222059 * A229396 A301655 A048940

Adjacent sequences:  A252928 A252929 A252930 * A252932 A252933 A252934

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 24 2014

STATUS

approved

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Last modified May 31 02:51 EDT 2020. Contains 334747 sequences. (Running on oeis4.)