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A196968 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,2,1 for x=0,1,2,3,4 0
1, 7, 34, 815, 31899, 3602632, 986337603, 654433849619, 1060308532244235 (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 0's, every 3 is next to 3 2's, every 4 is next to 4 1's

Diagonal of A196974

LINKS

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

EXAMPLE

Some solutions for n=4

..0..2..0..0....2..0..0..2....0..2..0..0....0..0..0..2....0..2..0..0

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

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

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

CROSSREFS

Sequence in context: A027842 A232043 A027683 * A000829 A247158 A285802

Adjacent sequences:  A196965 A196966 A196967 * A196969 A196970 A196971

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 08 2011

STATUS

approved

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Last modified October 14 03:58 EDT 2019. Contains 327995 sequences. (Running on oeis4.)