A221307 Number of nX5 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with every occupancy equal to zero or two

0, 90, 0, 38146, 0, 19642342, 0, 9842336697, 0, 4907450696408, 0, 2441328266555768, 0, 1213489893520857350, 0, 602992641919618581949, 0, 299597420150822374508346, 0, 148848899893861061853934856, 0

Offset

1,2

Comments

Column 5 of A221308

Links

Table of n, a(n) for n=1..21.

Example

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

Crossrefs

Sequence in context: A087341 A093405 A348166 * A058631 A078293 A247899

Adjacent sequences: A221304 A221305 A221306 * A221308 A221309 A221310

Keyword

nonn

Author

R. H. Hardin Jan 09 2013

Status

approved