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A188359 Number of arrangements of 4 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero 1
29, 117, 257, 497, 749, 1205, 1569, 2161, 2765, 3589, 4177, 5377, 6077, 7253, 8561, 10017, 10941, 12837, 13873, 16017, 17933, 19845, 21105, 24097, 25981, 28245, 30593, 33729, 35325, 39397, 41105, 44449, 47517, 50517, 53905, 59009, 61053, 64405, 68033 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A188358

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..135

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A050527 A097461 A042646 * A042648 A042650 A158560

Adjacent sequences:  A188356 A188357 A188358 * A188360 A188361 A188362

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 28 2011

STATUS

approved

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Last modified May 20 15:40 EDT 2013. Contains 225463 sequences.