A265664 Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any horizontal or vertical neighbor equal to 3-1.

2, 0, 4, 16, 60, 228, 1024, 4288, 18172, 76838, 326264, 1390048, 5947760, 25515274, 109801760, 473895774, 2050771696, 8896415264, 38680996104, 168532976250, 735715851956, 3217440736916, 14093823129980, 61831989407076

Offset

1,1

Comments

Row 3 of A265663.

Links

R. H. Hardin, Table of n, a(n) for n = 1..104

Example

Some solutions for n=4
..0..0..0..1....0..1..0..0....2..2..2..1....2..2..1..0....1..0..1..2
..1..0..1..2....1..2..1..0....1..2..1..0....2..1..0..0....0..1..2..2
..2..1..2..2....2..2..2..1....0..1..0..0....1..2..1..0....0..0..1..2

Crossrefs

Cf. A265663.

Sequence in context: A320491 A295907 A317364 * A320490 A374401 A326215

Adjacent sequences: A265661 A265662 A265663 * A265665 A265666 A265667

Keyword

nonn

Author

R. H. Hardin, Dec 12 2015

Status

approved