A196916 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,3,2,4,0 for x=0,1,2,3,4

1, 2, 7, 37, 602, 18354, 1272060, 208122448, 79321631051, 70822976472060, 147945365445395494, 721450315462495908444

Offset

1,2

Comments

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

Diagonal of A196922

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A102743 A195068 A342412 * A182331 A173762 A180269

Adjacent sequences: A196913 A196914 A196915 * A196917 A196918 A196919

Keyword

nonn

Author

R. H. Hardin Oct 07 2011

Status

approved