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A012002 arctan(log(cos(x)))=-1/2!*x^2-2/4!*x^4+14/6!*x^6+568/8!*x^8... 0
0, -1, -2, 14, 568, 2144, -1061312, -65851696, 3745115008, 1232648783744, 50799435228928, -36670923310299136, -8828746813705828352, 954888000296009790464, 1122466427244127979911168 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

CROSSREFS

Sequence in context: A048137 A005806 A015184 * A012005 A294353 A156172

Adjacent sequences:  A011999 A012000 A012001 * A012003 A012004 A012005

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Added missing 0 at start, otherwise this is OK. - N. J. A. Sloane, Dec 17 2011

STATUS

approved

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Last modified February 16 18:53 EST 2019. Contains 320165 sequences. (Running on oeis4.)