A188359 Number of arrangements of 4 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero

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

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: A097461 A244635 A042646 * A042648 A233046 A042650

Adjacent sequences: A188356 A188357 A188358 * A188360 A188361 A188362

Keyword

nonn

Author

R. H. Hardin Mar 28 2011

Status

approved