A197063 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,1,3,0,2 for x=0,1,2,3,4

1, 5, 76, 3466, 645970, 387792259, 814152081238, 5880410307808966, 145748906353392828573

Offset

1,2

Comments

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

Diagonal of A197069

Links

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

Example

Some solutions for n=4
..1..0..3..0....0..0..0..0....0..3..0..1....0..0..3..0....0..3..0..0
..1..3..0..0....0..3..2..0....0..0..0..1....0..0..0..1....3..0..3..0
..0..0..1..1....3..0..3..0....0..0..3..0....0..0..3..1....0..0..3..0
..0..0..0..0....0..3..0..0....0..1..1..0....0..3..0..0....1..1..0..0

Crossrefs

Sequence in context: A136300 A196689 A196725 * A144997 A088756 A319186

Adjacent sequences: A197060 A197061 A197062 * A197064 A197065 A197066

Keyword

nonn

Author

R. H. Hardin Oct 09 2011

Status

approved