id:A064140 - OEIS Search Results

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Sum of unitary divisors of central binomial coefficient C(n,[n/2]).

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1, 3, 4, 12, 18, 30, 48, 144, 240, 400, 1152, 1920, 3360, 6048, 10080, 30240, 54432, 90720, 181440, 302400, 806400, 1451520, 2903040, 4838400, 8985600, 16174080, 31449600, 56609280, 139968000, 264384000, 497664000, 1492992000, 2786918400 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=A034448[A001405(n)]`
	CROSSREFS	`A034448, A001405.` `Sequence in context: A026847 A026880 A026891 this_sequence A064139 A026744 A123765` `Adjacent sequences: A064137 A064138 A064139 this_sequence A064141 A064142 A064143`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Sep 11 2001`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

AT&T Labs Research