id:A009767 - OEIS Search Results

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Expansion of tan(tanh(x))*sin(x)/2.

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1, 120, 241920, 2352430080, 70008319180800, 4981141593037209600, 724337282211580477440000, 193082117289145211195228160000, 87097726450270042926290105794560000 (list; graph; listen)

	OFFSET	`0,2`
	MATHEMATICA	`Tan[ x^2 ]/2 (* [ x^(4n+2) ] *)`
	CROSSREFS	`A024348.` `Sequence in context: A123380 A008701 A158043 this_sequence A003789 A046987 A127232` `Adjacent sequences: A009764 A009765 A009766 this_sequence A009768 A009769 A009770`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended and signs tested 03/97.`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

AT&T Labs Research