A221811 Number of 3Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns

0, 41, 154, 3906, 32636, 486331, 5202774, 66756344, 772945086, 9475253764, 112494210565, 1359628053466, 16269612307575, 195771981733605, 2348419076818492, 28219682481306224, 338773827925545799

Offset

1,2

Comments

Row 3 of A221809

Links

R. H. Hardin, Table of n, a(n) for n = 1..96

Example

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

Crossrefs

Sequence in context: A142630 A259835 A082252 * A105100 A141988 A347075

Adjacent sequences: A221808 A221809 A221810 * A221812 A221813 A221814

Keyword

nonn

Author

R. H. Hardin Jan 26 2013

Status

approved