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A203339 Number of n X n 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 0
1, 5, 635, 503409, 3742207236, 360171255368417 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203346

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A209589 A060758 A256070 * A253690 A068421 A142535

Adjacent sequences:  A203336 A203337 A203338 * A203340 A203341 A203342

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 31 2011

STATUS

approved

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Last modified April 16 18:53 EDT 2021. Contains 343050 sequences. (Running on oeis4.)