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A197173 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,2,1,0,0 for x=0,1,2,3,4 0
1, 5, 41, 969, 92206, 22335117, 16686610707, 35396160304609, 218937410204781995, 3910004408912399352584 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Every 0 is next to 0 2's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 0's

Diagonal of A197180

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions containing all values 0 to 4 for n=4

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

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

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

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

CROSSREFS

Sequence in context: A181033 A189997 A342439 * A052113 A318294 A093433

Adjacent sequences:  A197170 A197171 A197172 * A197174 A197175 A197176

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 11 2011

STATUS

approved

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Last modified October 22 21:23 EDT 2021. Contains 348180 sequences. (Running on oeis4.)