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A217224 Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no 2-loops and with no occupancy greater than 2 1
0, 38, 1648, 67956, 2662621, 102825095, 3940138931, 150405053021, 5729680653464, 218036689302796, 8292350386134653, 315276121028319608, 11984839981037388864, 455548467001108257477, 17314744679135811905542 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A217227

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..26

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A041685 A221385 A158766 * A272036 A055605 A217342

Adjacent sequences:  A217221 A217222 A217223 * A217225 A217226 A217227

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2013

STATUS

approved

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Last modified May 26 18:08 EDT 2020. Contains 334630 sequences. (Running on oeis4.)