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A202806 Number of n X n nonnegative integer arrays with each row and column increasing from zero by 0, 1 or 2 0
1, 3, 32, 1177, 146300, 60758779, 83834499040, 383108603365234, 5786835759666959842, 288547665952004154207686, 47452156644340908611972658594, 25719338921489550833572201554228792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A202812

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

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

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

..0..1..1..1....0..0..1..2....0..2..2..2....0..1..3..3....0..2..3..5

CROSSREFS

Sequence in context: A129431 A297558 A283716 * A054780 A203323 A222683

Adjacent sequences:  A202803 A202804 A202805 * A202807 A202808 A202809

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 24 2011

STATUS

approved

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Last modified December 6 04:52 EST 2021. Contains 349562 sequences. (Running on oeis4.)