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A193708 Number of arrays of -6..6 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero 1
1, 13, 139, 1787, 11913, 102895, 883493, 7534239, 62963491, 533335257, 4512230169, 38134861983, 322180217835, 2723529411351, 23020233823025, 194563962109999, 1644444704071007, 13899067616530479, 117475708664617727 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A193710

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=7

..0...-6....0....0...-6...-6....0...-6....0...-6....0....0...-6....0...-6....0

.-3....4...-6...-4....4....1...-4....5...-4....6...-2...-5...-2...-3....3...-5

.-1....2....4....4....2....6....5...-3....4....6....2...-4....6....1....5....4

..1...-5....2....2....5...-1...-3....4....4...-3...-4....6....2....3...-2....1

..3....4....3....0...-3....3....2....2...-4...-3....2....3...-6...-1...-3...-3

.-2....3...-6...-6...-5....0....2....4....0....1...-4...-5....6...-2...-6....0

.-2...-2....3....4....3...-2...-1...-6....4....2....6...-4....0....3....6....3

CROSSREFS

Sequence in context: A125425 A016145 A300694 * A195464 A064103 A266630

Adjacent sequences:  A193705 A193706 A193707 * A193709 A193710 A193711

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 02 2011

STATUS

approved

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Last modified October 15 23:54 EDT 2019. Contains 328038 sequences. (Running on oeis4.)