A222162 Number of (n+4)X1 arrays of occupancy after each element moves up to +-4 places but not 0 and without 2-loops

81, 329, 1216, 4499, 16750, 62531, 231973, 855590, 3147832, 11573804, 42548081, 156375085, 574525894, 2110266004, 7749866077, 28458386767, 104495519709

Offset

1,1

Comments

Column 4 of A222165

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Sequence in context: A236821 A237511 A237504 * A237481 A237474 A237868

Adjacent sequences: A222159 A222160 A222161 * A222163 A222164 A222165

Keyword

nonn

Author

R. H. Hardin Feb 10 2013

Status

approved