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 A188251 Number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero 1
 12, 120, 548, 1504, 3292, 6376, 10564, 17040, 25436, 36808, 49556, 68912, 87804, 113384, 144644, 180912, 216044, 267160, 312404, 377904, 446588, 519976, 590420, 696576, 791164, 898456, 1016756, 1159280, 1278636, 1460936, 1598916, 1784224 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A188249 LINKS R. H. Hardin, Table of n, a(n) for n = 1..47 EXAMPLE Some solutions for n=4 ..3...-2...-2...-3...-1...-1....1....1....4....1...-2...-4....2....2...-1...-3 .-3...-2....3...-4...-1...-3....3...-2....3...-2...-4...-2...-1....1...-1...-2 ..2....3...-1....3....3....2....4...-4...-4...-1....2....1....2...-2....4....2 ..3....1...-3...-2....2....1...-3....3...-2...-3...-4....3...-4...-4....3....2 ..3...-1...-2...-3...-2....1....1....2....4....1...-2...-3...-3....2...-3...-3 CROSSREFS Sequence in context: A006953 A164877 A121032 * A093334 A001816 A354697 Adjacent sequences: A188248 A188249 A188250 * A188252 A188253 A188254 KEYWORD nonn AUTHOR R. H. Hardin Mar 25 2011 STATUS approved

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Last modified December 7 18:23 EST 2023. Contains 367660 sequences. (Running on oeis4.)