A193122 Number of n X n symmetric 0..5 arrays with each element equal to the sum mod 6 of two of its horizontal and vertical neighbors

0, 3, 39, 1881, 462153, 536702346, 2300614078203

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 4X4
..0..0..5..0....2..4..2..3....2..1..2..4....4..2..0..0....2..4..5..4
..0..0..5..1....4..2..5..1....1..5..4..2....2..2..0..0....4..2..1..5
..5..5..0..1....2..5..3..4....2..4..1..3....0..0..0..0....5..1..0..0
..0..1..1..2....3..1..4..2....4..2..3..0....0..0..0..0....4..5..0..0

Crossrefs

Sequence in context: A187536 A369945 A084881 * A015017 A210921 A290516

Adjacent sequences: A193119 A193120 A193121 * A193123 A193124 A193125

Keyword

nonn

Author

R. H. Hardin Jul 16 2011

Status

approved