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A188358
T(n,k)=Number of arrangements of n+1 numbers x(i) in -k..k with the sum of x(i)*x(i+1) equal to zero
16
5, 9, 15, 13, 45, 29, 17, 91, 117, 91, 21, 153, 257, 565, 197, 25, 231, 497, 1775, 1953, 627, 29, 325, 749, 4201, 7369, 9153, 1477, 33, 435, 1205, 8051, 22229, 49747, 37269, 4671, 37, 561, 1569, 14477, 45801, 181449, 262925, 173409, 11693, 41, 703, 2161
OFFSET
1,1
COMMENTS
Table starts
.....5.......9.......13........17.........21..........25..........29
....15......45.......91.......153........231.........325.........435
....29.....117......257.......497........749........1205........1569
....91.....565.....1775......4201.......8051.......14477.......22583
...197....1953.....7369.....22229......45801......100885......163745
...627....9153....49747....181449.....480363.....1171345.....2295051
..1477...37269...262925...1264985....3882729....11535493....25217201
..4671..173409..1763151..10396729...40629247...136061137...355442823
.11693..766869.10536621..81850801..383541193..1540834589..4602176797
.36487.3589357.70819767.684867741.4033546763.18592832393.65556183495
LINKS
EXAMPLE
Some solutions for n=6 k=4
.-4...-1...-4....0....3....0...-1....0...-4...-1...-1...-1...-2...-1....1...-3
..0...-2...-3...-2...-4...-4...-3...-4....0...-1...-2...-3...-2....0...-2...-1
.-4....2....3....1....3....4...-3...-1....4....0....1....1...-2....4....1....1
..4...-1...-1....1....3....4....0...-2....0....0...-3...-4....1...-4...-4....2
..4....2....2....1....1....0....1....3...-2...-3...-1...-1...-2...-4....3...-3
..3....1...-2....0...-4....1...-3...-2....0...-1....0....2....1...-4....4...-1
.-4....4...-3...-1...-4....0....3...-3...-4....4....3....1...-2....4....2....1
CROSSREFS
Row 1 is A016813
Row 2 is A014634
Sequence in context: A107980 A163161 A331556 * A228218 A361993 A314993
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Mar 28 2011
STATUS
approved