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 A164381 Triangle T(n,k) read by rows: T(n,k)=If[Mod[n, k]/k >= 0 && Mod[n, k]/k <= 2/9, 1, If[Mod[n, k]/k > 2/9 && Mod[n, k]/k <= 4/9, -1, 0]]. 1
 1, 1, 1, 1, 0, 1, 1, 1, -1, 1, 1, 0, 0, -1, 1, 1, 1, 1, 0, 1, 1, 1, 0, -1, 0, -1, 1, 1, 1, 1, 0, 1, 0, -1, 1, 1, 1, 0, 1, -1, 0, 0, -1, 1, 1, 1, 1, -1, 0, 1, 0, -1, -1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS G. C. Greubel, Table of n, a(n) for the first 50 rows, flattened EXAMPLE {1}, {1, 1}, {1, 0, 1}, {1, 1, -1, 1}, {1, 0, 0, -1, 1}, {1, 1, 1, 0, 1, 1}, {1, 0, -1, 0, -1, 1, 1}, {1, 1, 0, 1, 0, -1, 1, 1}, {1, 0, 1, -1, 0, 0, -1,1, 1}, {1, 1, -1, 0, 1, 0, -1, -1, 1, 1} MATHEMATICA T[n_, k_] = If[Mod[n, k]/k >= 0 && Mod[n, k]/k <= 2/9, 1, If[Mod[n, k]/k > 2/9 && Mod[n, k]/k <= 4/9, -1, 0]]; Table[Table[T[n, k], {k, 1, n}], {n, 1, 10}]; Flatten[%] CROSSREFS Cf. A051731. Sequence in context: A047999 A323378 A054431 * A106470 A106465 A071027 Adjacent sequences:  A164378 A164379 A164380 * A164382 A164383 A164384 KEYWORD sign,uned,less,tabl AUTHOR Roger L. Bagula and Mats Granvik, Aug 14 2009 STATUS approved

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Last modified April 22 22:19 EDT 2021. Contains 343197 sequences. (Running on oeis4.)