login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A008992 Denominators of coefficients in expansion of sqrt(sin(x)/x) (even powers only). 5
1, 12, 1440, 24192, 29030400, 5677056, 4649508864000, 100429391462400, 39023992111104000, 100609855353520128000, 8632325589332026982400000, 6946127879462505676800000, 3060839851788186207387648000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..210

MAPLE

A008992 := n -> denom(coeff(taylor(sqrt(sin(x)/x), x, 2*n+2), x, 2*n)): seq(A008992(n),  n=0..12); # Johannes W. Meijer, Feb 10 2013

MATHEMATICA

Denominator[CoefficientList[Series[Sqrt[Sin[x]/x], {x, 0, 50}], x][[1 ;; -1 ;; 2]]] (* G. C. Greubel, Jul 21 2018 *)

PROG

(Sage)

len = 12; T = taylor(sqrt(sin(x)/x), x, 0, 2*len+2)

[T.coeff(x, 2*n).denominator() for n in (0..len)]

# Peter Luschny, Dec 13 2012

CROSSREFS

Numerators are in A008991.

Appears in A220002 and A220466.

Sequence in context: A230519 A235535 A145835 * A260448 A271514 A181856

Adjacent sequences:  A008989 A008990 A008991 * A008993 A008994 A008995

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 19 02:29 EDT 2019. Contains 323377 sequences. (Running on oeis4.)