A167368 - OEIS

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A167368

sigma((n!!)!).

1, 3, 12, 159120, 6686252969760, 89050715142739003008099466232718435351438398888454549774336000 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..6.`
	FORMULA	`a(n) = A000203(A161563(n)).`
	MATHEMATICA	`Array[DivisorSigma[1, #!!! ]&, 7, 1]`
	PROG	`(PARI) A167368(n)=sigma( prod(k=0, n\2-1, n-2*k) ! ) \\ - M. F. Hasler, Feb 07 2011`
	CROSSREFS	`Cf. A062569, A167367.` `Sequence in context: A169815 A239891 A226129 * A215240 A068697 A010258` `Adjacent sequences: A167365 A167366 A167367 * A167369 A167370 A167371`
	KEYWORD	`nonn,less`
	AUTHOR	`Vladimir Joseph Stephan Orlovsky, Nov 01 2009`
	STATUS	`approved`

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Last modified August 18 17:58 EDT 2017. Contains 290732 sequences.