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 A188349 Number of arrangements of n+1 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero 0
 5, 45, 257, 4201, 45801, 1171345, 25217201, 870473329, 30807035021, 1370460938381 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A188358 LINKS Table of n, a(n) for n=1..10. EXAMPLE Some solutions for n=4 ..2...-2...-3....1....0....4....4....2...-4...-3...-1....4....2...-4...-2....4 ..0....1...-4....2...-3....1....2....1...-2....0...-4....0....0....4...-1....4 .-1....3....2...-4...-3....2...-4...-2....1....1....0...-2...-2....4...-1...-3 .-1...-1...-4...-1....3...-1....1...-1....3....0....1....2....2....0....1....2 ..1...-2...-1...-2....0....4....4....2...-3...-4...-4....2....2....2...-2....1 CROSSREFS Sequence in context: A079139 A269911 A249638 * A302526 A303408 A241275 Adjacent sequences: A188346 A188347 A188348 * A188350 A188351 A188352 KEYWORD nonn AUTHOR R. H. Hardin Mar 28 2011 STATUS approved

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Last modified February 29 02:52 EST 2024. Contains 370401 sequences. (Running on oeis4.)