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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 (list; table; graph; refs; listen; history; text; internal format)
 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 R. H. Hardin, Table of n, a(n) for n = 1..178 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: A115380 A107980 A163161 * A228218 A314993 A314994 Adjacent sequences:  A188355 A188356 A188357 * A188359 A188360 A188361 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 28 2011 STATUS approved

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)