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 A009382 Expansion of e.g.f.: log(1+tan(x)/exp(x)). 1
 0, 1, -3, 13, -74, 565, -5318, 60163, -792504, 11933945, -202119498, 3803708863, -78738133484, 1778090543125, -43499376725678, 1146033155079163, -32350004720613264, 974047813919045105, -31161267745173747858 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 FORMULA a(n) ~ (n-1)! * (-1)^(n+1) / r^n, where r = 0.5313908566521572046202664406047153136830749994... is the root of the equation exp(-r) = tan(r). - Vaclav Kotesovec, Jan 24 2015 MATHEMATICA With[{nn=20}, CoefficientList[Series[Log[1+Tan[x]/Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Apr 22 2014 *) CROSSREFS Sequence in context: A020094 A189886 A333890 * A110193 A038762 A276894 Adjacent sequences:  A009379 A009380 A009381 * A009383 A009384 A009385 KEYWORD sign,easy AUTHOR EXTENSIONS Extended with signs by Olivier Gérard, Mar 15 1997 Prior Mathematica program replaced and definition clarified by Harvey P. Dale, Apr 22 2014 STATUS approved

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Last modified September 25 13:01 EDT 2020. Contains 337344 sequences. (Running on oeis4.)