A193611 Number of n X n symmetric 0..4 arrays with no element equal to the sum mod 5 of all its horizontal and vertical neighbors

4, 64, 4096, 1048580, 1073745920, 4398046511104, 72057594037927936

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A053718 A053773 A053763 * A193755 A194501 A348315

Adjacent sequences: A193608 A193609 A193610 * A193612 A193613 A193614

Keyword

nonn

Author

R. H. Hardin Jul 31 2011

Status

approved