A221653 Number of n X 3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns.

2, 24, 230, 2594, 28478, 313721, 3449644, 37942960, 417316514, 4589956344, 50483589902, 555254580431, 6107085156536, 67170072001106, 738784285695336, 8125675702282959, 89371968083241970, 982976551394628990

Offset

1,1

Comments

Column 3 of A221655.

Links

R. H. Hardin, Table of n, a(n) for n = 1..40

Example

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

Crossrefs

Cf. A221655.

Sequence in context: A147538 A180388 A288270 * A219205 A025131 A270564

Adjacent sequences: A221650 A221651 A221652 * A221654 A221655 A221656

Keyword

nonn

Author

R. H. Hardin Jan 21 2013

Status

approved