id:A098557 - OEIS Search Results

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E.g.f. (1/2)(1+x)ln((1+x)/(1-x)).

+0
5

0, 1, 2, 2, 8, 24, 144, 720, 5760, 40320, 403200, 3628800, 43545600, 479001600, 6706022400, 87178291200, 1394852659200, 20922789888000, 376610217984000, 6402373705728000, 128047474114560000, 2432902008176640000 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n+1)=n!+(n-1)!(1-(-1)^n)/2; a(n+2)=2*A052558(n).`
	CROSSREFS	`Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), Nov 12 2009: (Start)` `Cf. A109613 (odd numbers repeated).` `Equals the first left hand column of A167552.` `Equals the first right hand column of A167556.` `A098557(n)*A064455(n) equals the second right hand column of A167556(n).` `(End)` `Sequence in context: A151384 A113464 A054093 this_sequence A003616 A079895 A053047` `Adjacent sequences: A098554 A098555 A098556 this_sequence A098558 A098559 A098560`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 14 2004`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

AT&T Labs Research