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A221554 Number of 4Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns 0
4, 494, 47976, 4107189, 354947070, 30632388919, 2643033185667, 228021702640082, 19671424819923462 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A221551

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A053953 A024058 A330579 * A210310 A324155 A221550

Adjacent sequences:  A221551 A221552 A221553 * A221555 A221556 A221557

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 19 2013

STATUS

approved

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Last modified October 16 18:14 EDT 2021. Contains 348042 sequences. (Running on oeis4.)