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A188249
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T(n,k)=Number of arrangements of n+2 nonzero numbers x(i) in -k..k with the sum of x(i)*x(i+1) equal to zero
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15
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4, 16, 0, 36, 20, 12, 64, 52, 120, 0, 100, 144, 548, 300, 40, 144, 208, 1504, 1632, 1284, 0, 196, 436, 3292, 7092, 12692, 4132, 140, 256, 532, 6376, 16484, 58824, 51196, 16272, 0, 324, 816, 10564, 43440, 193232, 368588, 355396, 57808, 504, 400, 1072, 17040, 75080
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OFFSET
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1,1
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COMMENTS
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Table starts
...4.....16.......36.........64.........100.........144..........196
...0.....20.......52........144.........208.........436..........532
..12....120......548.......1504........3292........6376........10564
...0....300.....1632.......7092.......16484.......43440........75080
..40...1284....12692......58824......193232......521124......1142180
...0...4132....51196.....368588.....1399640.....4875112.....11953848
.140..16272...355396....2880240....14715004....55994544....168083116
...0..57808..1657632...20265640...123729664...591604824...2026547348
.504.223308.10858368..156028036..1247614580..6764014136..27843005992
...0.828456.54754656.1154193268.11199296500.75116513672.355600251460
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LINKS
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EXAMPLE
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Some solutions for n=6 k=4
.-2...-3...-3...-1...-2...-1....1....2...-3...-4....3...-4...-2...-4...-4...-2
.-2...-4...-4...-4...-4...-4...-4...-4...-2...-3...-4...-3...-3...-4...-3...-4
.-3...-2...-2....4....3....2....1....1...-4....3...-2....1....3....2....1....2
.-4...-2...-1...-1....1...-1....2...-4....2...-4....1...-3...-1....2....4....4
..3....4...-4...-4...-2...-2...-1...-2...-2...-3....1....1...-2...-1....2...-3
.-2...-4....2...-3....1...-2...-2...-3....4....3....4...-3...-3....1...-3...-4
..1...-3...-3...-3....1...-2...-1....2....3....3....1....3...-2....3....3....4
.-2....4....4....3....4....2...-4....4...-2...-1...-3....3....4...-4...-2....2
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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