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A060629 1/2+Sum_{n >= 1) a(n)*x^(2*n)/(4^n*(2*n)!) = 1/Pi*EllipticK(x). 0
1, 27, 2250, 385875, 112521150, 49921883550, 31336679474100, 26440323306271875, 28866957423047493750, 39599692192936551926250, 66678681708870074070727500, 135213253391970365203090248750 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

EllipticK(x) = 1/2*Pi + 1/8*Pi*x^2 + 9/128*Pi*x^4 + 25/512*Pi*x^6 + 1225/32768*Pi*x^8 + 3969/131072*Pi*x^10 + O(x^12).

CROSSREFS

Cf. A038533, A038534.

Sequence in context: A017307 A167725 A272630 * A287228 A086206 A323314

Adjacent sequences:  A060626 A060627 A060628 * A060630 A060631 A060632

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Apr 14 2001

STATUS

approved

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Last modified September 20 16:30 EDT 2019. Contains 327242 sequences. (Running on oeis4.)