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A067623 Consider the power series (x+1)^(1/3)=1+x/3-x^2/9+5x^3/81+...; sequence gives denominators of coefficients. 1
1, 3, 9, 81, 243, 729, 6561, 19683, 59049, 1594323, 4782969, 14348907, 129140163, 387420489, 1162261467, 10460353203, 31381059609, 94143178827, 2541865828329, 7625597484987, 22876792454961, 205891132094649 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) are powers of 3.

LINKS

Table of n, a(n) for n=0..21.

FORMULA

a(n) = 3^n*a(floor(n/3)). - Vladeta Jovovic, Mar 01 2004

CROSSREFS

Cf. A067622.

Equals 3^A004128(n).

Sequence in context: A000218 A139731 A124049 * A171557 A055156 A047912

Adjacent sequences:  A067620 A067621 A067622 * A067624 A067625 A067626

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 02 2002

STATUS

approved

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Last modified December 19 17:37 EST 2014. Contains 252238 sequences.