A221722 Number of n X 4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor.

21, 3605, 544757, 81980587, 12325049264, 1852447247829, 278394265759168, 41836968289680535, 6287169859547251975, 944818763789937611918, 141984605326159531366196, 21337022505681038084244109

Offset

1,1

Comments

Column 4 of A221723.

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

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

Crossrefs

Cf. A221723.

Sequence in context: A340331 A370085 A202980 * A153833 A221164 A264250

Adjacent sequences: A221719 A221720 A221721 * A221723 A221724 A221725

Keyword

nonn

Author

R. H. Hardin, Jan 22 2013

Status

approved