A196857 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,4,2,0,1 for x=0,1,2,3,4

1, 2, 7, 35, 473, 11280, 494579, 44461736, 7927841482, 2782301025984, 1928382976203757

Offset

1,2

Comments

Every 0 is next to 0 3's, every 1 is next to 1 4'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 A196863

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=4
..0..0..2..2....2..2..2..0....2..2..2..0....2..2..2..2....0..0..1..0
..0..0..2..2....2..0..2..2....2..0..2..2....2..0..0..2....0..1..4..1
..0..0..0..0....2..2..0..2....2..0..0..2....2..0..2..2....2..2..1..0
..0..0..0..0....0..2..2..2....2..2..2..2....2..2..2..0....2..2..0..0

Crossrefs

Sequence in context: A101514 A247240 A266356 * A111908 A060814 A192816

Adjacent sequences: A196854 A196855 A196856 * A196858 A196859 A196860

Keyword

nonn

Author

R. H. Hardin Oct 06 2011

Status

approved