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A197402 Number of nXn 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4 0
1, 9, 60, 3305, 356211, 93153650, 77683473682, 174585377113223 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

Diagonal of A197409

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

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

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

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

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

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

CROSSREFS

Sequence in context: A153820 A009139 A086018 * A213133 A159037 A138589

Adjacent sequences:  A197399 A197400 A197401 * A197403 A197404 A197405

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 14 2011

STATUS

approved

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Last modified August 28 08:35 EDT 2015. Contains 261118 sequences.