A221424 Number of 6Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two

0, 64, 2250, 107695, 3813004, 156275181, 6079373768, 237226735061

Offset

1,2

Comments

Row 6 of A221419

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A008790 A183432 A017211 * A181241 A053107 A330820

Adjacent sequences: A221421 A221422 A221423 * A221425 A221426 A221427

Keyword

nonn

Author

R. H. Hardin Jan 15 2013

Status

approved