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A012242
log(cos(tanh(x)))=-1/2!*x^2+6/4!*x^4-72/6!*x^6+1456/8!*x^8...
0
-1, 6, -72, 1456, -47104, 2390784, -180612096, 18625189888, -2431403622400, 384624656646144, -72343735465672704, 16067422146130345984, -4193787904779561730048, 1276366494840535652499456
OFFSET
0,2
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Log[Cos[Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, May 27 2014 *)
CROSSREFS
Sequence in context: A052730 A010796 A038095 * A138446 A099029 A120331
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved