A064073 - OEIS

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A064073

Generalized tangent number d(8,n).

8, 1408, 739328, 806453248, 1506300919808, 4297849713983488, 17390688314209599488, 94727563504456856240128, 668321603392783694711226368, 5928595592752632717848942215168 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	REFERENCES	`D. Shanks. "Generalized Euler and Class Numbers." Math. Comput. 21, 689-694, 1967. Math. Comput. 22, 699, 1968.`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	FORMULA	`E.g.f.: Sum_{k>=0} a(k)x^(2k+1)/(2k+1)! = 2*sin(4x)/cos(8x).`
	CROSSREFS	`Equals 2^(4n+3) * A000464(n-1).` `Equals 2^(4n+3) * A000464(n).` `Sequence in context: A123268 A088080 A160103 * A201492 A172938 A096970` `Adjacent sequences: A064070 A064071 A064072 * A064074 A064075 A064076`
	KEYWORD	`nonn,easy`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com), Aug 31, 2001`

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Last modified February 17 11:30 EST 2012. Contains 206011 sequences.