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 A188249 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 15
 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 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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 LINKS R. H. Hardin, Table of n, a(n) for n = 1..159 EXAMPLE 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 CROSSREFS Column 1 is 4*A138364 Sequence in context: A061849 A052107 A069019 * A228559 A165410 A016486 Adjacent sequences:  A188246 A188247 A188248 * A188250 A188251 A188252 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 25 2011 STATUS approved

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