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A221696 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction 1
1, 987, 63676, 7033429, 659020617, 64509677154, 6233675847228, 604346923784252, 58538232535028520, 5671250113728678882, 549411330594167686392, 53225495837252796349285, 5156336905625087231654148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221693

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..18

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A248352 A072316 A222351 * A221128 A045733 A250490

Adjacent sequences: A221693 A221694 A221695 * A221697 A221698 A221699

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2013

STATUS

approved

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Last modified January 29 15:01 EST 2023. Contains 359923 sequences. (Running on oeis4.)