A137480 - OEIS

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A137480

a(n)=4a(n-2).

12, 21, 48, 84, 192, 336, 768, 1344, 3072, 5376, 12288 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	FORMULA	`G.f.: (21x + 12)/(-4x^2 + 1). a(n) = -(9/4)sqrt(2)(1/2)^(-1/2(-1)^n)(-2)^n+(33/4)2^nsqrt(2)(1/2)^(-(1/2)(-1)^n) - Alexander R. Povolotsky (pevnev(AT)juno.com), Apr 25 2008`
	CROSSREFS	`Sequence in context: A179899 A085926 A071263 * A157157 A048344 A039402` `Adjacent sequences: A137477 A137478 A137479 * A137481 A137482 A137483`
	KEYWORD	`nonn`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Apr 22 2008`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.