id:A067626 - OEIS Search Results

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Sqrt((1-cos(y))/2)= sum(n>=0,(-1)^n*y^(2n+1)/a(n)).

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2, 48, 3840, 645120, 185794560, 81749606400, 51011754393600, 42849873690624000, 46620662575398912000, 63777066403145711616000, 107145471557284795514880000, 216862434431944426122117120000 (list; graph; listen)

	OFFSET	`0,1`
	LINKS	`Eric Weisstein's World of Mathematics, Riemann-Siegel Functions`
	FORMULA	`a(n)=A000165(2n+2) where A000165(k) are the double factorial numbers 2^k*k!=(2k)!!`
	MAPLE	for n from 0 to 30 by 2 do printf(`%d, `, 2^(n+1)*(n+1)!) od:
	CROSSREFS	`Cf. A000165.` `Sequence in context: A112103 A114714 A087085 this_sequence A053071 A002820 A053290` `Adjacent sequences: A067623 A067624 A067625 this_sequence A067627 A067628 A067629`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 02 2002`
	EXTENSIONS	`More terms and Maple code from James A. Sellers (sellersj(AT)math.psu.edu), Feb 11, 2002`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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