A193121 Number of n X n symmetric 0..4 arrays with each element equal to the sum mod 5 of two of its horizontal and vertical neighbors

0, 1, 25, 1061, 200989, 167167273, 476648665905, 5119795667808469

Offset

1,3

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for 4X4
..2..1..3..0....4..2..1..3....3..4..1..2....2..1..0..0....4..2..3..3
..1..4..2..2....2..3..4..2....4..2..3..1....1..1..0..0....2..4..1..0
..3..2..0..0....1..4..0..0....1..3..2..4....0..0..1..1....3..1..2..2
..0..2..0..0....3..2..0..0....2..1..4..3....0..0..1..2....3..0..2..4

Crossrefs

Sequence in context: A167257 A346160 A012692 * A246923 A066852 A123204

Adjacent sequences: A193118 A193119 A193120 * A193122 A193123 A193124

Keyword

nonn

Author

R. H. Hardin Jul 16 2011

Status

approved