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A183942 Number of strings of n numbers x(i) in -7..7 with sums of x(i) and of x(i)*x(i+1) both zero 0
1, 1, 15, 57, 1033, 6259, 80851, 844829, 10894795, 130817901, 1781556515, 23640849007, 329173058411, 4518115025537, 63025886167079 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 7 of A183944

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=4

.-3....0....1...-7....0....2...-4....1...-6...-4....1....0....4....6....0....3

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

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

..3....1...-1....7....2...-2....0....0....0....1...-1....4...-1...-6...-6...-3

CROSSREFS

Sequence in context: A084815 A240152 A261419 * A012691 A020187 A261798

Adjacent sequences:  A183939 A183940 A183941 * A183943 A183944 A183945

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2011

STATUS

approved

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Last modified June 24 11:11 EDT 2017. Contains 288697 sequences.