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A221261 Number of 7Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2 0
0, 4096, 5822, 1250753956, 278802326676, 1080371161000000, 720107530988047980, 1273696206975009956961, 1220346471047321694829098 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 7 of A221255

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A186490 A223694 A186489 * A069273 A043424 A138174

Adjacent sequences:  A221258 A221259 A221260 * A221262 A221263 A221264

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2013

STATUS

approved

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Last modified September 18 12:28 EDT 2020. Contains 337169 sequences. (Running on oeis4.)