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 A009648 Expansion of tan(log(1+x))/exp(x). 0
 0, 1, -3, 10, -44, 255, -1841, 15818, -156960, 1762709, -22076535, 304867506, -4600188108, 75280188035, -1327718893749, 25103478695090, -506480711742496, 10860420245412873, -246630317697276235, 5912837973247721914 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS FORMULA a(n) ~ n! * (-1)^(n+1) * exp(1-exp(-Pi/2)) / ((exp(Pi/2)-1) * (1-exp(-Pi/2))^n). - Vaclav Kotesovec, Jan 23 2015 MATHEMATICA Tan[ Log[ 1+x ] ]/Exp[ x ] CoefficientList[Series[Tan[Log[1 + x]]/E^x, {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *) CROSSREFS Sequence in context: A259352 A205803 A329258 * A007125 A247053 A102911 Adjacent sequences:  A009645 A009646 A009647 * A009649 A009650 A009651 KEYWORD sign,easy AUTHOR EXTENSIONS Extended with signs by Olivier Gérard, Mar 15 1997 STATUS approved

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Last modified June 21 08:18 EDT 2021. Contains 345358 sequences. (Running on oeis4.)