A128542 - OEIS

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A128542

((2n)^(2n)-1)/(2n+1)/(2n-1).

1, 17, 1333, 266305, 101010101, 62350352785, 56984650387477, 72340172838076673, 121815504877079063701, 262801002506265664160401, 706890015246831381773595701, 2319540481478754999041880822337 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`p divides a(p-1) for prime p>3.`
	LINKS	`Table of n, a(n) for n=1..12.`
	FORMULA	`a(n) = ((2n)^(2n)-1)/(2n+1)/(2n-1). a(n) = A048861(2n)/(2n+1)/(2n-1). a(n) = A023037(2n)/(2n+1). a(n) = A089815(2n-2).`
	MATHEMATICA	`Table[((2n)^(2n)-1)/(2n+1)/(2n-1), {n, 1, 20}]`
	CROSSREFS	`Cf. A048861 = n^n-1. Cf. A023037, A089815.` `Sequence in context: A022012 A022546 A188717 * A067409 A219562 A183236` `Adjacent sequences: A128539 A128540 A128541 * A128543 A128544 A128545`
	KEYWORD	`nonn`
	AUTHOR	`Alexander Adamchuk, May 08 2007`
	STATUS	`approved`

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Last modified May 23 16:49 EDT 2013. Contains 225610 sequences.