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A188248 Number of arrangements of n+2 nonzero numbers x(i) in -8..8 with the sum of x(i)*x(i+1) equal to zero 0

%I

%S 256,816,17040,142532,2347608,28779900,445304272,6250275112,

%T 95625385124,1414314289436

%N Number of arrangements of n+2 nonzero numbers x(i) in -8..8 with the sum of x(i)*x(i+1) equal to zero

%C Column 8 of A188249

%e Some solutions for n=4

%e .-8....2....4...-2...-6....3...-5...-2....4...-7...-2....1...-5....7....7....2

%e .-5...-5....2...-5...-2...-2....2...-7....6....2....7...-6....4...-4...-4...-6

%e ..4...-1...-2...-4...-7...-5...-2...-1....4....8...-7...-1...-8....8....7...-6

%e ..3....3...-1...-6....6...-2...-7....1...-5...-1...-1....2...-4....7....8....5

%e ..8....2...-6....6....8...-7...-8....4....7...-2...-8....2...-4....4....4....3

%e .-7....1....2...-3...-4....4....7...-6....1...-2...-6...-1...-1...-6...-8...-3

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 25 2011

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Last modified August 12 23:52 EDT 2022. Contains 356077 sequences. (Running on oeis4.)