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A012030 arctan(sin(sinh(x))) = x - 2/3!*x^3 +16/5!*x^5 - 440/7!*x^7 + 20224/9!*x^9 - .... 0
1, -2, 16, -440, 20224, -1582976, 178612864, -27969867008, 5765737517056, -1516228355846144, 495092243779256320, -196552136456231321600, 93232152295610535018496, -52074797114273752377786368 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) appears to be divisible by 2^n, with the factor 1, -1, 4, -55, 1264, -49468, 2790826, -218514586, 22522412176,.... - Ralf Stephan, Aug 14 2013

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A009397 A229023 A009700 * A012682 A012678 A012146

Adjacent sequences:  A012027 A012028 A012029 * A012031 A012032 A012033

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified November 28 05:17 EST 2020. Contains 338699 sequences. (Running on oeis4.)