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A221090 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor 1
0, 64, 3024, 279841, 20489472, 1572836281, 118704053710, 8994906720801, 680750019301486, 51538469967056164, 3901482828808418205, 295352521055213734564, 22358767209627320059672, 1692606840605154489536964 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221087

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..24

EXAMPLE

Some solutions for n=3

..1..3..0....0..1..0....1..3..1....0..3..1....0..3..1....0..1..1....0..2..2

..0..2..1....2..3..0....0..1..1....0..2..0....1..1..1....0..4..0....0..3..1

..0..2..2....0..2..1....0..2..0....2..1..1....0..2..1....1..0..2....0..0..0

..0..1..0....1..2..0....0..2..1....0..2..0....0..2..0....0..3..0....0..3..1

CROSSREFS

Sequence in context: A221831 A282397 A297100 * A264094 A181249 A260857

Adjacent sequences:  A221087 A221088 A221089 * A221091 A221092 A221093

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 01 2013

STATUS

approved

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Last modified August 20 20:50 EDT 2019. Contains 326155 sequences. (Running on oeis4.)