A221674 Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out left turns

2, 27, 400, 5741, 81910, 1165913, 16583044, 235810525, 3352967744, 47674475534, 677859111916, 9638113778155, 137039061732784, 1948482984616486, 27704405262039888, 393913655872817605, 5600840943900558440

Offset

1,1

Comments

Column 3 of A221676

Links

R. H. Hardin, Table of n, a(n) for n = 1..97

Example

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

Crossrefs

Sequence in context: A121971 A278790 A277832 * A363961 A240701 A240638

Adjacent sequences: A221671 A221672 A221673 * A221675 A221676 A221677

Keyword

nonn

Author

R. H. Hardin Jan 21 2013

Status

approved