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A203331 Number of n X n 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 0
1, 6, 1311, 2224079, 40063085907, 11867803667695158 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203338

LINKS

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

EXAMPLE

Some solutions for n=4

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

..5..5..5..4....5..5..5..2....5..5..4..3....2..3..3..3....3..4..3..4

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

..5..5..5..1....0..0..5..5....0..0..5..5....1..1..1..0....4..4..4..4

CROSSREFS

Sequence in context: A209590 A076781 A055306 * A172625 A066037 A279924

Adjacent sequences:  A203328 A203329 A203330 * A203332 A203333 A203334

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 31 2011

STATUS

approved

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Last modified April 14 22:47 EDT 2021. Contains 342971 sequences. (Running on oeis4.)