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A221695 Number of 3Xn 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, 144, 3112, 95076, 2627760, 74531185, 2098932856, 59210733473, 1669668324450, 47086135048676, 1327854674388881, 37446255355092156, 1056006037475086696, 29779973215497145163, 839812326958816104725, 23683188619380401285537 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A221693

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..69

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A074316 A264107 A231584 * A223323 A251433 A223300

Adjacent sequences:  A221692 A221693 A221694 * A221696 A221697 A221698

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2013

STATUS

approved

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Last modified July 1 10:51 EDT 2022. Contains 354970 sequences. (Running on oeis4.)