A068562 Denominators of coefficients in (1+x)^(1/3)-(1-x)^(1/3) power series.

3, 81, 729, 19683, 1594323, 14348907, 387420489, 10460353203, 94143178827, 7625597484987, 205891132094649, 1853020188851841, 50031545098999707, 12157665459056928801, 109418989131512359209, 2954312706550833698643

Offset

1,1

Links

Table of n, a(n) for n=1..16.

Mathematica

Take[CoefficientList[Series[CubeRoot[1+x]-CubeRoot[1-x], {x, 0, 40}], x]//Denominator, {2, -1, 2}] (* Harvey P. Dale, Nov 14 2025 *)

Crossrefs

Cf. A068561.

Sequence in context: A137994 A074386 A116009 * A123656 A229842 A223187

Adjacent sequences: A068559 A068560 A068561 * A068563 A068564 A068565

Keyword

easy,frac,nonn

Author

Benoit Cloitre, Mar 30 2002

Status

approved