A221871 Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction

0, 162, 2847, 109441, 2902629, 89325897, 2568285560, 75961646488, 2218174542607, 65123784146089, 1907357352061683, 55920523423826597, 1638742556637284630, 48032522511443152307, 1407738930106228011912, 41259605922847789338479

Offset

1,2

Comments

Column 3 of A221873

Links

R. H. Hardin, Table of n, a(n) for n = 1..82

Example

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

Crossrefs

Sequence in context: A288489 A303413 A249295 * A245955 A128803 A035746

Adjacent sequences: A221868 A221869 A221870 * A221872 A221873 A221874

Keyword

nonn

Author

R. H. Hardin Jan 28 2013

Status

approved