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A221761 Number of 7Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns 0
0, 64, 0, 45956, 381174, 122732982, 4330440582 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 7 of A221755

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A243775 A066608 A247067 * A085339 A203262 A174927

Adjacent sequences:  A221758 A221759 A221760 * A221762 A221763 A221764

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 24 2013

STATUS

approved

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Last modified January 22 22:16 EST 2020. Contains 331166 sequences. (Running on oeis4.)