A221237 Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops

0, 53, 1979, 67710, 2217402, 71862107, 2319920239, 74798189113, 2410533664375, 77672428997113, 2502628646064793, 80633851221600834, 2597977434265900778, 83705168795842477962, 2696924567819650577863, 86893079359980110185109

Offset

1,2

Comments

Column 3 of A221240

Links

R. H. Hardin, Table of n, a(n) for n = 1..88

Example

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

Crossrefs

Sequence in context: A180365 A282931 A210783 * A059694 A263516 A243231

Adjacent sequences: A221234 A221235 A221236 * A221238 A221239 A221240

Keyword

nonn

Author

R. H. Hardin Jan 06 2013

Status

approved