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A221789 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns 1
0, 0, 1, 16, 173, 1325, 15936, 187794, 2167196, 25071259, 290320330, 3362811279, 38954814644, 451260930462, 5227519694115, 60556885619049, 701505602257606, 8126407466223744, 94138215587957627, 1090519135777805628 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row 4 of A221787

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..28

EXAMPLE

All solutions for n=3

..0..2..1

..1..2..0

..0..2..1

..1..2..0

CROSSREFS

Sequence in context: A200673 A230510 A238725 * A018209 A021174 A021374

Adjacent sequences:  A221786 A221787 A221788 * A221790 A221791 A221792

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 25 2013

STATUS

approved

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Last modified September 24 09:10 EDT 2021. Contains 347630 sequences. (Running on oeis4.)