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A221128 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor 0
1, 987, 118472, 16436223, 2152770692, 282454178707, 36946896429843, 4831791752404317, 631836540867287034, 82621661239567004631 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221125

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A072316 A222351 A221696 * A045733 A250490 A258552

Adjacent sequences:  A221125 A221126 A221127 * A221129 A221130 A221131

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2013

STATUS

approved

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Last modified October 27 22:24 EDT 2021. Contains 348305 sequences. (Running on oeis4.)