A193123 Number of n X n symmetric 0..6 arrays with each element equal to the sum mod 7 of two of its horizontal and vertical neighbors

0, 1, 37, 2239, 569881, 907290415

Offset

1,3

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4X4
..4..2..1..6....0..0..0..0....1..4..3..4....1..4..1..3....2..1..5..2
..2..5..6..5....0..0..0..0....4..1..6..1....4..3..5..2....1..6..3..4
..1..6..1..2....0..0..4..4....3..6..3..4....1..5..4..6....5..3..6..1
..6..5..2..4....0..0..4..1....4..1..4..1....3..2..6..5....2..4..1..2

Crossrefs

Sequence in context: A297313 A297505 A099807 * A295846 A297719 A296738

Adjacent sequences: A193120 A193121 A193122 * A193124 A193125 A193126

Keyword

nonn

Author

R. H. Hardin Jul 16 2011

Status

approved