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 A139134 a(n) = n-th derivative of Sec(Exp(z)-1) at z=0. 4
 1, 0, 1, 3, 12, 65, 417, 3094, 26243, 250371, 2652754, 30910935, 392895789, 5409783392, 80214503397, 1274329677391, 21594115259540, 388790596531173, 7411710847692157, 149142571391245758, 3159081458947418511 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..100 FORMULA E.G.F. = sec(exp(z)-1) a(n) ~ 2*n!/((2+Pi)*log((2+Pi)/2)^(n+1)). - Vaclav Kotesovec, Sep 25 2013 MATHEMATICA Table[D[Sec[Exp[x] - 1], {x, n}] /. x -> 0, {n, 0, 30}] CROSSREFS Cf. A080832. Sequence in context: A359660 A196559 A111262 * A216373 A200309 A256124 Adjacent sequences: A139131 A139132 A139133 * A139135 A139136 A139137 KEYWORD easy,nonn AUTHOR Richard Chapling (r.chappers(AT)gmail.com), Jun 05 2008 EXTENSIONS Typo in Mathematica program corrected by Vincenzo Librandi, Sep 26 2013 STATUS approved

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Last modified February 24 05:49 EST 2024. Contains 370293 sequences. (Running on oeis4.)