A047685 Numerators of coefficients in Taylor series for log(tan(x)/x).

0, 1, 7, 62, 127, 146, 1414477, 32764, 16931177, 11499383114, 91546277357, 13299018868, 1982765468311237, 88306001369044, 130106068440304534, 7400951287808330864888, 16555640865486520478399, 16179883156293315362

Offset

0,3

References

CRC Standard Mathematical Tables and Formulae, 30th ed. 1996, p. 42.

Links

Table of n, a(n) for n=0..17.

Example

(1/3)*x^2 + (7/90)*x^4 + (62/2835)*x^6 + (127/18900)*x^8 + (146/66825)*x^10 + ...

Crossrefs

Cf. A047686.

Sequence in context: A317430 A145507 A254121 * A171078 A368057 A180776

Adjacent sequences: A047682 A047683 A047684 * A047686 A047687 A047688

Keyword

nonn,easy,frac

Author

N. J. A. Sloane

Status

approved