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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
0, 90, 0, 38146, 0, 19642342, 0, 9842336697, 0, 4907450696408, 0, 2441328266555768, 0, 1213489893520857350, 0, 602992641919618581949, 0, 299597420150822374508346, 0, 148848899893861061853934856, 0 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 2 21:10 EST 2023. Contains 360024 sequences. (Running on oeis4.)