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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A012115 Expansion of e.g.f. of cos(arcsin(arcsinh(x))), even powers only. 3
 1, -1, 1, -49, 897, -96801, 6803457, -1275363153, 207592347393, -60889593787713, 17888210916886017, -7679611833095218545, 3530100224793651058305, -2109645360096014314212705, 1387893136694794953345211905, -1109191050707015380265790041745, 984063632341385922413073350925825 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS G. C. Greubel, Table of n, a(n) for n = 0..224 EXAMPLE 1 - 1/2!*x^2 + 1/4!*x^4 - 49/6!*x^6 + 897/8!*x^8... MATHEMATICA With[{nn = 50}, Table[(CoefficientList[Series[Cos[ArcSin[ArcSinh[x]]], {x, 0, 2*nn}], x]*Range[0, 2*nn]!)[[n]], {n, 1, 2*nn + 1, 2}]] (* G. C. Greubel, Apr 12 2017 *) PROG (PARI) x = 'x + O('x^40); select(x->x, Vec(serlaplace(cos(asin(asinh(x)))))) \\ Michel Marcus, Mar 09 2017 CROSSREFS Cf. A012248. Sequence in context: A278284 A110906 A193940 * A284642 A304046 A264877 Adjacent sequences: A012112 A012113 A012114 * A012116 A012117 A012118 KEYWORD sign AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) EXTENSIONS More terms from Michel Marcus, Mar 09 2017 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 September 27 13:49 EDT 2023. Contains 365702 sequences. (Running on oeis4.)