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A221932 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns 0
1, 1367, 153652, 20246283, 2568601026, 326363935235, 41397744561659, 5246761195398438, 664828879659318271, 84233175060135140710 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221929

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

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

..0..0..1....1..1..1....0..1..2....2..0..1....0..1..1....0..0..1....0..6..0

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

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

CROSSREFS

Sequence in context: A020409 A231268 A192823 * A331464 A167724 A156574

Adjacent sequences:  A221929 A221930 A221931 * A221933 A221934 A221935

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 01 2013

STATUS

approved

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Last modified June 23 11:29 EDT 2021. Contains 345397 sequences. (Running on oeis4.)