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A221658 Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns 0
0, 40, 2594, 233781, 17254611, 1312503181, 99007036296, 7489842900854 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221655

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A003741 A263553 A049215 * A188154 A268151 A269824

Adjacent sequences:  A221655 A221656 A221657 * A221659 A221660 A221661

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2013

STATUS

approved

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Last modified January 22 15:13 EST 2022. Contains 350481 sequences. (Running on oeis4.)