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A221807 Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns 1
1, 214, 3906, 197048, 6328365, 247277805, 8830682187, 328546555815, 11994407265981, 441751061429506, 16202916180999264, 595448412788077566, 21862647259907974086, 803056054269698852052, 29491857372420704871557 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221809

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..27

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A076159 A258961 A204486 * A200043 A184600 A278093

Adjacent sequences:  A221804 A221805 A221806 * A221808 A221809 A221810

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 26 2013

STATUS

approved

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Last modified January 21 03:58 EST 2022. Contains 350473 sequences. (Running on oeis4.)