login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A008961 Numerators of Taylor series for 1/(sin x + tan x). 2
1, -1, -23, -947, -1733, -21781, -43311113, -2723179, -6414155401, -785453333257, -7699945982293, -66166822052531, -239092621861482143, -271166505959717, -74473963890443961601, -163219188105035970948619, -153312677184465775645847, -625566886054776334597601 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..269

MATHEMATICA

Take[Numerator[CoefficientList[2x #&/@Normal[Series[1/(Sin[x]+Tan[x]), {x, 0, 40}]], x]], {1, -1, 2}] (* Harvey P. Dale, Feb 11 2015 *)

CROSSREFS

Cf. A009724.

Sequence in context: A335496 A183523 A233339 * A232757 A139193 A077283

Adjacent sequences:  A008958 A008959 A008960 * A008962 A008963 A008964

KEYWORD

sign,frac

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Harvey P. Dale, Feb 11 2015

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 11 05:30 EDT 2021. Contains 342886 sequences. (Running on oeis4.)