A221724 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor

1, 306, 11733, 544757, 24019048, 1068474439, 47427140282, 2106033021852, 93510052180466, 4152013229849883, 184355733843153070, 8185679969358665185, 363456710563714005229, 16138033279951566079150, 716553304870897490539683

Offset

1,2

Comments

Row 3 of A221723

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for n=3
..1..0..0....2..2..0....1..2..2....1..1..0....2..3..0....0..3..1....0..5..0
..0..1..1....0..4..1....0..0..0....1..1..2....0..0..0....0..2..2....0..0..1
..3..3..0....0..0..0....2..1..1....2..1..0....0..4..0....1..0..0....0..1..2

Crossrefs

Sequence in context: A223073 A064257 A221854 * A023908 A035843 A128477

Adjacent sequences: A221721 A221722 A221723 * A221725 A221726 A221727

Keyword

nonn

Author

R. H. Hardin Jan 22 2013

Status

approved