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A006656 Denominators of expansion of sinh x / sin x.
(Formerly M2294)
3
1, 3, 3, 21, 9, 11, 21, 9, 1, 133, 693, 69, 7, 189, 3, 7161, 231, 7, 399, 63, 77, 3311, 4347, 987, 49, 33, 33, 627, 57, 59, 7161, 2079, 11, 10787, 207, 2343, 1463, 4389, 231, 1659, 6237, 913, 9933, 693, 161, 7301833, 19184319, 4389, 11, 99, 33 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..50.

J. M. Gandhi, The coefficients of cosh x/cos x and a note on Carlitz's coefficients of sinh x/sin x, Math. Mag., 31 (1958), 185-191.

MATHEMATICA

With[{nn=100}, Denominator[Take[CoefficientList[Series[Sinh[x]/Sin[x], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]]] (* Harvey P. Dale, Jul 10 2013 *)

CROSSREFS

Cf. A000965.

Sequence in context: A292953 A292221 A112534 * A205452 A159910 A172485

Adjacent sequences:  A006653 A006654 A006655 * A006657 A006658 A006659

KEYWORD

nonn,easy,frac

AUTHOR

N. J. A. Sloane, Simon Plouffe

EXTENSIONS

More terms from Harvey P. Dale, Jul 10 2013

STATUS

approved

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Last modified February 28 06:33 EST 2021. Contains 341695 sequences. (Running on oeis4.)