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A024225 Expansion of tan(sin(x))*x/2. 1
0, 1, 2, -9, -428, -5475, 251382, 21193459, 276227560, -106494482439, -11901572968150, 248514536608943, 277290379883298492, 34240556133396062229, -5078626013008010061410 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

FORMULA

a(n) = A009667(n)/2. [Martin Ettl, Nov 08 2012]

MATHEMATICA

nn = 30; t = Range[0, nn]! CoefficientList[Series[Tan[Sin[x]]*x/2, {x, 0, nn}], x]; Take[t, {1, nn, 2}] (* T. D. Noe, Nov 08 2012 *)

CROSSREFS

Cf. A009667.

Sequence in context: A003818 A325619 A049299 * A266289 A000883 A086693

Adjacent sequences:  A024222 A024223 A024224 * A024226 A024227 A024228

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

STATUS

approved

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Last modified October 30 03:24 EDT 2020. Contains 338076 sequences. (Running on oeis4.)