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A189545 T(n,k)=Number of arrangements of n+1 nonzero numbers x(i) in -k..k with the sum of trunc(x(i)/x(i+1)) equal to zero 16
0, 4, 4, 12, 8, 0, 24, 28, 44, 12, 40, 72, 192, 152, 0, 60, 152, 544, 964, 552, 40, 84, 264, 1340, 3664, 5416, 2000, 0, 112, 432, 2520, 11276, 26804, 31280, 7628, 140, 144, 660, 4620, 26152, 97836, 204544, 173792, 28440, 0, 180, 968, 7716, 56440, 274132, 911144 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Table starts

...0......4.......12........24.........40..........60...........84

...4......8.......28........72........152.........264..........432

...0.....44......192.......544.......1340........2520.........4620

..12....152......964......3664......11276.......26152........56440

...0....552.....5416.....26804......97836......274132.......683144

..40...2000....31280....204544.....911144.....3022220......8655424

...0...7628...173792...1526520....8485264....33638540....111406336

.140..28440...977092..11544464...80270588...379997096...1456853916

...0.108792..5562216..87396896..762015216..4324466328..19269747584

.504.411888.31839976.665272176.7245223968.49387377504.256327259704

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..757

EXAMPLE

Some solutions for n=7 k=5

.-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-4...-5

.-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5

..1...-2...-2...-1....1...-5...-3....4....3...-4....3...-3....3....1...-4....3

..4....4....2...-3...-3....2....5...-1....5....4...-2....4....5...-1....3....3

..1...-1....3....2...-2...-3...-2....5...-5....3....3...-1....4...-2....4....3

.-3...-1...-1...-1...-3....1....5....2...-2....5....5....4....5...-5....3...-4

.-4....4...-1....3...-1...-3...-3....1....5...-2...-5....5....5...-1....4....5

..5....5....4...-1...-2...-1...-3....4...-4...-5...-2....2...-2....3...-3...-2

CROSSREFS

Column 1 is A028329(n/2) for even n

Row 1 is A046092(n-1)

Sequence in context: A272789 A273152 A322785 * A326993 A272990 A273645

Adjacent sequences: A189542 A189543 A189544 * A189546 A189547 A189548

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Apr 23 2011

STATUS

approved

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Last modified December 1 08:54 EST 2022. Contains 358459 sequences. (Running on oeis4.)