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A221427 Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without consecutive moves in the same direction 1
1, 217, 4390, 194879, 6688747, 250167826, 9077677881, 333226472511, 12173165267828, 445650138090486, 16298689612917528, 596369615071847374, 21816211474871696352, 798162015570301300322, 29199761336459862799952 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221429

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..30

EXAMPLE

Some solutions for n=3

..1..1..1..0....1..1..1..1....0..1..0..0....1..1..1..0....1..1..0..1

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

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

CROSSREFS

Sequence in context: A320715 A183778 A250448 * A086026 A100794 A048258

Adjacent sequences:  A221424 A221425 A221426 * A221428 A221429 A221430

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2013

STATUS

approved

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Last modified May 26 00:47 EDT 2022. Contains 354073 sequences. (Running on oeis4.)