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A188353
Number of arrangements of n+1 numbers x(i) in -4..4 with the sum of x(i)*x(i+1) equal to zero.
1
17, 153, 497, 4201, 22229, 181449, 1264985, 10396729, 81850801, 684867741, 5680170701, 48268778269, 410276328441, 3525682027185, 30364372592101, 262996695840081, 2283098828435689, 19886474577091625, 173553193860930897
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OFFSET
1,1
COMMENTS
Column 4 of
A188358
LINKS
R. H. Hardin,
Table of n, a(n) for n = 1..60
EXAMPLE
Some solutions for n=5
..0...-1...-1....0....0....0....0....0....1...-1....3....3...-1....2...-4....1
..2...-4...-3....0...-1....0...-4....4...-2...-1....2...-1....2....2...-1...-3
..1....4...-3....4...-3....4...-2...-1....0....1...-1...-3...-2...-4....4....3
..1....3....4....0....4...-1....4....0...-2....2....0....0...-3...-4....0....3
.-3...-3...-4....0....3...-2....0....1....1....1...-1....4....3....2....1....3
..0...-3...-4....4...-1...-1....3....4....4...-4....4....0....3...-2....0...-2
CROSSREFS
Sequence in context:
A161877
A221737
A139617
*
A162637
A247613
A010969
Adjacent sequences:
A188350
A188351
A188352
*
A188354
A188355
A188356
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Mar 28 2011
STATUS
approved
