A222347 Number of (n+3) X 1 arrays of occupancy after each element moves up to +-n places including 0.

21, 108, 440, 1690, 6405, 24276, 92340, 352674, 1352032

Offset

1,1

Comments

Row 3 of A222345.

Links

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

Example

Some solutions for n=3
..1....2....0....0....2....3....0....0....1....2....1....0....0....2....1....0
..1....0....2....1....1....2....0....0....1....3....1....1....3....2....3....1
..1....0....0....3....1....0....0....4....2....1....0....0....0....0....1....2
..1....4....1....2....1....0....6....0....1....0....1....0....1....2....0....0
..0....0....3....0....0....0....0....1....0....0....1....2....0....0....1....2
..2....0....0....0....1....1....0....1....1....0....2....3....2....0....0....1

Crossrefs

Cf. A222345.

Sequence in context: A041854 A219820 A071333 * A039611 A353622 A069307

Adjacent sequences: A222344 A222345 A222346 * A222348 A222349 A222350

Keyword

nonn

Author

R. H. Hardin, Feb 16 2013

Status

approved