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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
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
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.)