A284863 Denominators of exponential expansion of (3/(2*log(1+x)))*(1 - 1/(1+x)^(2/3)).

1, 3, 27, 27, 405, 729, 5103, 2187, 295245, 98415, 649539, 531441, 241805655, 55801305, 71744535, 14348907, 3658971285, 1162261467, 51526925037, 1162261467, 4027235983155, 575319426165, 3608821855035, 1412147682405, 642527195494275, 77103263459313, 480412641554181, 53379182394909

Offset

0,2

Comments

For the numerators see A284862, also for details.

The z-sequence for the Sheffer triangle A225466 is 2*A284862(n)/a(n).

Links

Table of n, a(n) for n=0..27.

Formula

a(n) = denominator(r(n)), with the rationals (in lowest terms) r(n) = [x^n/n!] (1/log((1+x)^(1/3)))*(1 - 1/(1+x)^(2/3)).

Example

See A284862.

Crossrefs

Cf. A225466, A284862.

Sequence in context: A058956 A010257 A334567 * A121068 A136895 A319391

Adjacent sequences: A284860 A284861 A284862 * A284864 A284865 A284866

Keyword

nonn,easy

Author

Wolfdieter Lang, Apr 09 2017

Status

approved