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A203543 Number of n X n 0..4 arrays with every nonzero element less than or equal to some NW, E or S neighbor 0
1, 25, 32920, 276550270, 33466433693229, 72614149907378126398, 2637221656906543119366072476, 1479737300994461631995281660020138894 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203550

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=5

..3..0..1..3..2....1..4..2..2..3....1..0..4..0..3....0..1..3..4..4

..3..2..1..3..4....0..4..3..1..4....1..0..4..0..3....2..0..1..1..4

..3..1..4..2..4....1..4..3..3..4....3..2..4..3..3....2..2..3..4..0

..3..4..4..4..4....3..4..2..4..4....4..3..4..2..3....1..2..3..4..2

..4..4..4..3..4....3..4..4..3..4....4..4..4..4..0....4..4..4..4..4

CROSSREFS

Sequence in context: A082211 A053766 A298467 * A034711 A325215 A076445

Adjacent sequences:  A203540 A203541 A203542 * A203544 A203545 A203546

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2012

STATUS

approved

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Last modified January 17 12:48 EST 2020. Contains 330958 sequences. (Running on oeis4.)