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A203436 Number of n X n 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 0
1, 8, 4124, 24278164, 1842430382222 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203443

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=5

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

..6..7..7..6..1....4..4..7..7..3....6..7..0..7..6....7..7..7..7..6

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

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

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

CROSSREFS

Sequence in context: A013742 A209592 A060760 * A159368 A167065 A303895

Adjacent sequences:  A203433 A203434 A203435 * A203437 A203438 A203439

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 01 2012

STATUS

approved

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Last modified May 17 19:51 EDT 2022. Contains 353778 sequences. (Running on oeis4.)