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A222556 Number of (n+2)X1 arrays of occupancy after each element moves up to +-n places but not 0 0
2, 20, 102, 427, 1668, 6372, 24230, 92279, 352596 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A222555

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

..0....1....3....0....2....1....4....1....1....0....2....0....0....3....4....3

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

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

CROSSREFS

Sequence in context: A107483 A220856 A035599 * A103101 A267678 A009357

Adjacent sequences:  A222553 A222554 A222555 * A222557 A222558 A222559

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 24 2013

STATUS

approved

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Last modified August 7 09:16 EDT 2020. Contains 336274 sequences. (Running on oeis4.)