A193612 Number of n X n symmetric 0..5 arrays with no element equal to the sum mod 6 of all its horizontal and vertical neighbors

5, 123, 15625, 9766908, 30517597530, 476837158203125, 37252902984619140625

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A320978 A196425 A362725 * A195949 A354654 A067081

Adjacent sequences: A193609 A193610 A193611 * A193613 A193614 A193615

Keyword

nonn

Author

R. H. Hardin Jul 31 2011

Status

approved