A193486 Number of n X n symmetric 0..7 arrays with each element equal to the product mod 8 of two of its horizontal and vertical neighbors

0, 2, 22, 1250, 168193, 125116658, 311793921998

Offset

1,2

Links

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

Example

Some solutions for 4X4
..0..0..4..4....4..6..1..1....1..7..5..3....1..7..7..4....0..0..2..2
..0..0..1..7....6..6..1..1....7..3..5..7....7..7..1..4....0..1..1..5
..4..1..7..7....1..1..3..3....5..5..3..7....7..1..1..1....2..1..5..5
..4..7..7..1....1..1..3..1....3..7..7..1....4..4..1..1....2..5..5..1

Crossrefs

Sequence in context: A152558 A202947 A177410 * A337577 A054948 A330124

Adjacent sequences: A193483 A193484 A193485 * A193487 A193488 A193489

Keyword

nonn

Author

R. H. Hardin Jul 27 2011

Status

approved