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

Author

Wolfdieter Lang, Apr 09 2017

Keywords

• nonn
• easy

Comments

For the numerators see A284862, also for details.

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

Examples

			See A284862.
		

Crossrefs

Cf. A225466, A284862.

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)).