A221508 Number of 2Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction

0, 9, 44, 446, 3334, 27540, 219070, 1766136, 14168766, 113870162, 914550470, 7346946970, 59015933032, 474072774244, 3808166264624, 30590638905810, 245731343642532, 1973934759524284, 15856413036814582, 127372929035331130

Offset

1,2

Comments

Row 2 of A221507

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

Some solutions for n=3
..0..3..0....0..4..0....1..2..0....0..2..2....1..0..0....0..2..0....0..1..0
..1..1..1....1..0..1....1..2..0....0..2..0....0..4..1....1..2..1....0..3..2

Crossrefs

Sequence in context: A282722 A084023 A084016 * A301397 A125679 A037207

Adjacent sequences: A221505 A221506 A221507 * A221509 A221510 A221511

Keyword

nonn

Author

R. H. Hardin Jan 18 2013

Status

approved