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A202908 Number of n X n 0..7 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 0
1, 680, 9509536, 4062408076312, 83625724607330716008, 81642366196089406720417732740 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A202916

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

..1..7..2..5....2..5..1..1....5..2..5..1....5..4..6..1....2..7..7..3

..1..7..1..5....4..7..6..2....5..4..5..1....5..3..7..7....5..2..7..0

..4..2..0..3....7..7..4..5....3..3..1..2....7..3..6..1....5..7..6..3

..4..0..2..2....6..0..0..5....4..4..2..2....7..1..3..0....1..7..2..0

CROSSREFS

Sequence in context: A154036 A185765 A206015 * A309245 A118509 A043691

Adjacent sequences:  A202905 A202906 A202907 * A202909 A202910 A202911

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 26 2011

STATUS

approved

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Last modified January 25 23:56 EST 2022. Contains 350572 sequences. (Running on oeis4.)