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A221237 Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops 1
0, 53, 1979, 67710, 2217402, 71862107, 2319920239, 74798189113, 2410533664375, 77672428997113, 2502628646064793, 80633851221600834, 2597977434265900778, 83705168795842477962, 2696924567819650577863, 86893079359980110185109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A221240

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..88

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A180365 A282931 A210783 * A059694 A263516 A243231

Adjacent sequences:  A221234 A221235 A221236 * A221238 A221239 A221240

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2013

STATUS

approved

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Last modified January 21 22:08 EST 2022. Contains 350480 sequences. (Running on oeis4.)