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A189538
Number of arrangements of n+1 nonzero numbers x(i) in -2..2 with the sum of trunc(x(i)/x(i+1)) equal to zero
1
4, 8, 44, 152, 552, 2000, 7628, 28440, 108792, 411888, 1586424, 6066032, 23474384, 90378912, 351072012, 1358520600, 5293045208, 20561697200, 80309986856, 312934745552, 1224770426672, 4784290151264, 18757260263352, 73421632108656
OFFSET
1,1
COMMENTS
Column 2 of A189545
LINKS
EXAMPLE
Some solutions for n=5
.-2....2....1...-2...-1....2...-1....2...-1...-1...-2...-2...-1...-1....2....2
..1...-2...-1...-1...-1...-1...-2...-1....1....2....2....2....1....2....2...-1
..2....2...-2....1....1...-1...-2....2...-2...-1...-1...-2....1...-1...-2....1
.-2....2....2...-1...-1...-1...-2....1...-1...-2...-1...-2...-1...-1...-2....1
.-2...-2....1....1...-2....1....1....1....1...-2...-1...-1...-1...-1...-2...-2
.-1...-1...-2....1...-2....1...-2...-1...-2...-2...-1....1...-2...-2....1...-1
CROSSREFS
Sequence in context: A045639 A337782 A285751 * A351071 A270352 A183394
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 23 2011
STATUS
approved