A129440 - OEIS

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A129440

a(0)=0, a(1)=1, a(2)=5 and for n>2: a(n)=a(n-1)*(a(n-1)+1)*(2*a(n-1)+1)/6.

0, 1, 5, 55, 56980, 61667666167030, 78172010815921069181209893626754427513955 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`a(n) = A000330(if n<=2 then n else a(n)).`
	CROSSREFS	`Cf. A007501.` `Sequence in context: A063855 A081785 A144996 * A045729 A067515 A072318` `Adjacent sequences: A129437 A129438 A129439 * A129441 A129442 A129443`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 15 2007`

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Last modified February 17 09:17 EST 2012. Contains 206009 sequences.