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A197443 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,1,1,0,0 for x=0,1,2,3,4 0
1, 5, 81, 4837, 1108699, 982926107, 3148323076125, 37516007592943532, 1657994465210882573048 (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 1'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 A197450

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

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

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

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

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

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

CROSSREFS

Sequence in context: A188419 A009634 A165435 * A337852 A280220 A280675

Adjacent sequences: A197440 A197441 A197442 * A197444 A197445 A197446

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 15 2011

STATUS

approved

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Last modified December 1 05:02 EST 2022. Contains 358454 sequences. (Running on oeis4.)