A265621 Number of 3 X n 0..3*n-1 arrays with upper left zero and lower right 3*n-1 and each element differing from its horizontal and diagonal neighbors by a power of two.

3, 45, 5625, 392320, 13534874, 3413887598, 1130198405370, 53578062122213, 13108218265241141, 992125896408438521, 244355616796007755084, 26142858782722268963104, 5253247467346100142679906

Offset

1,1

Comments

Row 3 of A265619.

Links

R. H. Hardin, Table of n, a(n) for n = 1..33

Example

Some solutions for n=3
..0..1..3....0..2..1....0..4..5....0..2..3....0..4..3....0..4..3....0..8..7
..2..4..3....2..4..6....6..4..5....3..4..3....0..4..2....2..4..5....8..4..6
..5..6..8....2..0..8....8..7..8....3..4..8....5..4..8....8..4..8....5..7..8

Crossrefs

Cf. A265619.

Sequence in context: A057863 A302156 A229415 * A124488 A086683 A155203

Adjacent sequences: A265618 A265619 A265620 * A265622 A265623 A265624

Keyword

nonn

Author

R. H. Hardin, Dec 10 2015

Status

approved