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A197084 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,2,0,1 for x=0,1,2,3,4 0
1, 2, 25, 631, 71867, 21996614, 21989908007, 68650847877254, 670636652224421841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

Diagonal of A197090

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A121252 A322727 A090733 * A119829 A059363 A216661

Adjacent sequences:  A197081 A197082 A197083 * A197085 A197086 A197087

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2011

STATUS

approved

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Last modified November 19 16:37 EST 2019. Contains 329323 sequences. (Running on oeis4.)