id:A048243 - OEIS Search Results

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Number of non-unitary divisors of C(n,[ n/2 ]) = A000005[ n ] - A034444[ n ].

+0
5

0, 0, 0, 0, 0, 2, 0, 0, 4, 10, 0, 8, 8, 16, 8, 16, 0, 16, 0, 16, 32, 64, 0, 32, 80, 128, 224, 320, 256, 352, 64, 128, 256, 512, 256, 640, 640, 1024, 512, 1280, 512, 1024, 512, 1024, 2560, 3328, 1280, 2432, 2432, 3584, 3584, 5120, 2048, 2816, 2048, 4096, 8192 (list; graph; listen)

	OFFSET	`1,6`
	EXAMPLE	`At n=10, he C(10,5) = 252=497 has 18 divisors, 8 are unitary and the residual 10 are non-unitary; thus a[ 10 ]=10=18-8.`
	CROSSREFS	`A048105 applied to terms of A001405.` `Adjacent sequences: A048240 A048241 A048242 this_sequence A048244 A048245 A048246` `Sequence in context: A098699 A021837 A011449 this_sequence A057611 A094597 A143160`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

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