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A221272 Number of nX4 arrays of occupancy after each element moves to some king-move neighbor, with every occupancy equal to zero or two 0
1, 52, 596, 7252, 94659, 1250015, 16474842, 217194702, 2863102280, 37731750319, 497133557199, 6548899949298, 86261110576994, 1136131886838454 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221273

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=4

..0..2..2..0....0..2..0..2....0..2..2..2....0..2..2..0....0..2..2..2

..2..0..0..2....0..0..2..0....0..0..0..0....2..0..2..0....0..0..0..0

..0..2..2..0....2..2..0..2....2..0..2..0....0..2..0..2....0..2..2..2

..0..2..2..0....2..0..0..2....2..2..2..0....0..2..2..0....0..0..2..2

CROSSREFS

Sequence in context: A294055 A285753 A100413 * A254137 A249712 A255945

Adjacent sequences:  A221269 A221270 A221271 * A221273 A221274 A221275

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2013

STATUS

approved

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Last modified June 28 05:40 EDT 2022. Contains 354903 sequences. (Running on oeis4.)