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A203499 Number of n X n 0..6 arrays with every nonzero element less than or equal to some NW, E or S neighbor 0
1, 49, 296814, 17549687172, 22732800433168401, 915339495505231856501713 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203506

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

..3..5..0..6..6....5..5..3..2..0....5..6..6..6..6....5..0..6..6..6

..5..5..5..0..6....4..4..3..2..0....2..5..4..5..6....5..5..2..4..6

CROSSREFS

Sequence in context: A100418 A239169 A134725 * A013843 A303146 A023936

Adjacent sequences:  A203496 A203497 A203498 * A203500 A203501 A203502

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2012

STATUS

approved

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Last modified February 17 18:14 EST 2020. Contains 332005 sequences. (Running on oeis4.)