A166725 - OEIS

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A166725

(2*n+1)*25^n

1, 75, 3125, 109375, 3515625, 107421875, 3173828125, 91552734375, 2593994140625, 72479248046875, 2002716064453125, 54836273193359375, 1490116119384765625, 40233135223388671875, 1080334186553955078125 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 0..200`
	FORMULA	`G.f.: (1+25x)/(1-25x)^2.` `sum(k>=0, 1/a(k) ) = (5/2)*log(3/2).`
	PROG	`(PARI) a(n)=(2n+1)25^n` `(MAGMA) [(2n+1)25^n: n in [0..20]]; // Vincenzo Librandi, Jun 08 2011`
	CROSSREFS	`Cf. (2n+1)4^n A058962, (2n+1)9^n A155988, log(3/2) A016578.` `Sequence in context: A202257 A017791 A017738 * A075913 A134228 A110902` `Adjacent sequences: A166722 A166723 A166724 * A166726 A166727 A166728`
	KEYWORD	`nonn`
	AUTHOR	`Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Oct 20 2009`

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Last modified February 16 10:23 EST 2012. Contains 205904 sequences.