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 A188353 Number of arrangements of n+1 numbers x(i) in -4..4 with the sum of x(i)*x(i+1) equal to zero 1
 17, 153, 497, 4201, 22229, 181449, 1264985, 10396729, 81850801, 684867741, 5680170701, 48268778269, 410276328441, 3525682027185, 30364372592101, 262996695840081, 2283098828435689, 19886474577091625, 173553193860930897 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A188358 LINKS R. H. Hardin, Table of n, a(n) for n = 1..60 EXAMPLE Some solutions for n=5 ..0...-1...-1....0....0....0....0....0....1...-1....3....3...-1....2...-4....1 ..2...-4...-3....0...-1....0...-4....4...-2...-1....2...-1....2....2...-1...-3 ..1....4...-3....4...-3....4...-2...-1....0....1...-1...-3...-2...-4....4....3 ..1....3....4....0....4...-1....4....0...-2....2....0....0...-3...-4....0....3 .-3...-3...-4....0....3...-2....0....1....1....1...-1....4....3....2....1....3 ..0...-3...-4....4...-1...-1....3....4....4...-4....4....0....3...-2....0...-2 CROSSREFS Sequence in context: A161877 A221737 A139617 * A162637 A247613 A010969 Adjacent sequences: A188350 A188351 A188352 * A188354 A188355 A188356 KEYWORD nonn AUTHOR R. H. Hardin Mar 28 2011 STATUS approved

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Last modified October 3 14:07 EDT 2023. Contains 365866 sequences. (Running on oeis4.)