

A197616


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


0




OFFSET

1,4


COMMENTS

Every 0 is next to 0 0's, every 1 is next to 1 3'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 A197623


LINKS

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


EXAMPLE

Some solutions containing all values 0 to 4 for n=4
..1..3..1..0....2..1..3..1....1..2..0..1....1..3..1..1....0..1..3..1
..1..1..4..1....1..4..1..0....3..1..1..3....2..1..1..3....1..4..1..1
..3..1..1..3....3..1..1..2....1..1..4..1....2..1..4..1....3..1..1..3
..1..0..2..1....1..1..3..1....1..3..1..2....1..3..1..0....1..2..2..1


CROSSREFS

Sequence in context: A190636 A019563 A285045 * A022149 A128801 A188484
Adjacent sequences: A197613 A197614 A197615 * A197617 A197618 A197619


KEYWORD

nonn


AUTHOR

R. H. Hardin Oct 16 2011


STATUS

approved



