The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A081021 Even order Taylor coefficients at x = 0 of exp( (sqrt(2)-sqrt(-2*x^2+2))/(-2*x^2+2)^(1/2) ), odd order coefficients being equal to zero. 2
 1, 12, 375, 22155, 2113020, 295956045, 57148456365, 14541025999500, 4712328126180675, 1894168782984052575, 924528651354021413700, 538492713580088225984025 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS G. C. Greubel, Table of n, a(n) for n = 1..224 FORMULA In Maple notation: a(n)=subs(x=0, diff(exp((sqrt(2)-sqrt(-2*x^2+2))/(-2*x^2+2)^(1/2), x\$2*n)), n=1, 2... MATHEMATICA Rest[With[{nmax = 100}, CoefficientList[Series[Exp[(Sqrt[2] - Sqrt[2 - 2*x^2])/(Sqrt[2 - 2*x^2]) ], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]]] (* G. C. Greubel, Sep 11 2018 *) CROSSREFS Cf. A081020. Sequence in context: A235685 A024298 A177112 * A269609 A251590 A196459 Adjacent sequences:  A081018 A081019 A081020 * A081022 A081023 A081024 KEYWORD nonn AUTHOR Karol A. Penson, Mar 01 2003 STATUS approved

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

Last modified July 23 21:10 EDT 2021. Contains 346265 sequences. (Running on oeis4.)