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A221892 Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns 1
0, 0, 0, 202, 2722, 31881, 416630, 5496803, 71900708, 940934266, 12320347932, 161293030438, 2111496138082, 27642157184325, 361871500036368, 4737358281430753, 62018044719943396, 811895156827216792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row 3 of A221890

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..70

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Sequence in context: A252993 A252987 A229640 * A332120 A064100 A159382

Adjacent sequences:  A221889 A221890 A221891 * A221893 A221894 A221895

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 30 2013

STATUS

approved

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Last modified August 16 05:55 EDT 2022. Contains 356160 sequences. (Running on oeis4.)