A221782 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns

1, 184, 7676, 311500, 12449782, 496125037, 19763197787, 787085360643, 31344203790093, 1248188259617209, 49704848595150246, 1979319928404980888, 78819337675566218873, 3138697184284703490208, 124987334716559797042649

Offset

1,2

Comments

Row 3 of A221780

Links

R. H. Hardin, Table of n, a(n) for n = 1..46

Example

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

Crossrefs

Sequence in context: A235250 A221931 A223117 * A296780 A035831 A094631

Adjacent sequences: A221779 A221780 A221781 * A221783 A221784 A221785

Keyword

nonn

Author

R. H. Hardin Jan 25 2013

Status

approved