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A183940 Number of strings of n numbers x(i) in -5..5 with sums of x(i) and of x(i)*x(i+1) both zero 1
1, 1, 11, 39, 497, 2343, 22881, 177535, 1682939, 14821961, 149400849, 1447662427, 14866001809, 149548074379, 1531694916059, 15535552043969, 159929685546853, 1644687110377919, 17107437074253385, 178041145616880947 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 5 of A183944

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..21

EXAMPLE

Some solutions for n=4

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

..0....0....0...-1....0....0....0....2....2....1...-4...-2....5....0....0....0

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

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

CROSSREFS

Sequence in context: A127867 A138050 A341232 * A335077 A077568 A122014

Adjacent sequences:  A183937 A183938 A183939 * A183941 A183942 A183943

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2011

STATUS

approved

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Last modified September 20 10:51 EDT 2021. Contains 347584 sequences. (Running on oeis4.)