The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A009576 Expansion of e.g.f. sinh(log(1+x))/cos(x). 1
 0, 1, -1, 6, -18, 115, -615, 4732, -36148, 337797, -3315645, 37027826, -440999526, 5768129783, -80507865347, 1210608394920, -19345811001000, 329208442723465, -5922785067664185, 112578608999452894, -2251115252850724090 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS G. C. Greubel, Table of n, a(n) for n = 0..448 FORMULA a(n) ~ n! * (-1)^(n+1) / (2*cos(1)). - Vaclav Kotesovec, Jan 23 2015 MATHEMATICA CoefficientList[Series[(x*(2 + x)*Sec[x])/(2*(1 + x)), {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *) With[{nmax = 50}, CoefficientList[Series[Sinh[Log[1 + x]]/Cos[x], {x, 0, nmax}], x]*Range[0, nmax]!] (* G. C. Greubel, Jan 21 208 *) PROG (PARI) x='x+O('x^30); concat([0], Vec(serlaplace(sinh(log(1+x))/cos(x)))) \\ G. C. Greubel, Jan 21 2018 CROSSREFS Sequence in context: A108735 A143556 A007126 * A009580 A125839 A117813 Adjacent sequences: A009573 A009574 A009575 * A009577 A009578 A009579 KEYWORD sign,easy AUTHOR R. H. Hardin EXTENSIONS Extended with signs by Olivier Gérard, Mar 15 1997 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 13 11:54 EDT 2024. Contains 371640 sequences. (Running on oeis4.)