A265637 Number of 3Xn 0..3*n-1 arrays with upper left zero and lower right 3*n-1 and each element differing from its horizontal, diagonal and antidiagonal neighbors by a power of two.

3, 21, 2660, 85492, 2331618, 206993090, 42763599173, 830409551666, 118433371523627, 3709178084192695, 709564144395637629, 26474898186117799270, 3187921008058618254721, 245528729947540095091943

Offset

1,1

Comments

Row 3 of A265635.

Links

R. H. Hardin, Table of n, a(n) for n = 1..91

Example

Some solutions for n=4
..0..4..3..1....0..2.10..8....0..4..3..1....0..8..9..1....0..4..6..7
..0..1..3..5....6..8.10..6....3..1..3..1....6..8..9.10....0..2..3..7
..0..1..9.11...10..8.10.11....3..7..9.11....6..8..9.11....3..2..3.11

Crossrefs

Cf. A265635.

Sequence in context: A290872 A365497 A012110 * A054739 A117508 A331897

Adjacent sequences: A265634 A265635 A265636 * A265638 A265639 A265640

Keyword

nonn

Author

R. H. Hardin, Dec 11 2015

Status

approved