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A252923 Number of n X n nonnegative integer arrays with upper left 0 and lower right n+n-6 and value increasing by 0 or 1 with every step right or down. 2
0, 0, 1, 615, 84910, 8241540, 759337545, 73117894428, 7578889491370, 848729993032718, 102072779621746876, 13069744040275286234, 1766655687081261435255, 250232365919081938956865, 36910187948533534644694094 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..20 (first 15 terms from R. H. Hardin)

EXAMPLE

Some solutions for n=4

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

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

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

..1..1..2..2....1..2..2..2....1..1..2..2....1..1..1..2....1..2..2..2

CROSSREFS

Diagonal of A252930.

Sequence in context: A210103 A191938 A195809 * A268245 A268102 A190029

Adjacent sequences:  A252920 A252921 A252922 * A252924 A252925 A252926

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 24 2014

STATUS

approved

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Last modified September 27 04:10 EDT 2021. Contains 347673 sequences. (Running on oeis4.)