A196796 - OEIS

A196796

Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,2,0,4,1 for x=0,1,2,3,4.

1, 7, 120, 7407, 1516652, 1029024216, 2336509457978, 17524876527067107, 436288315960458288785

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

Diagonal of A196802.

LINKS

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 06 2011

STATUS

approved