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A222162 Number of (n+4)X1 arrays of occupancy after each element moves up to +-4 places but not 0 and without 2-loops 0
81, 329, 1216, 4499, 16750, 62531, 231973, 855590, 3147832, 11573804, 42548081, 156375085, 574525894, 2110266004, 7749866077, 28458386767, 104495519709 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 19 15:37 EDT 2021. Contains 347564 sequences. (Running on oeis4.)