id:A094120 - OEIS Search Results

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a(n)=sum(k=1,n,sum(i=1,k,(-2)^valuation(i,2))).

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0, 1, 0, 0, 4, 9, 12, 16, 12, 9, 4, 0, 0, 1, 0, 0, 16, 33, 48, 64, 84, 105, 124, 144, 156, 169, 180, 192, 208, 225, 240, 256, 240, 225, 208, 192, 180, 169, 156, 144, 124, 105, 84, 64, 48, 33, 16, 0, 0, 1, 0, 0, 4, 9, 12, 16, 12, 9, 4, 0, 0, 1, 0, 0, 64, 129, 192, 256, 324, 393 (list; graph; listen)

	OFFSET	`1,5`
	PROGRAM	`(PARI) a(n)=sum(k=1, n, sum(i=1, k, (-2)^valuation(i, 2)))`
	CROSSREFS	`Cf. A006519.` `Sequence in context: A112652 A140399 A010386 this_sequence A066423 A072498 A072587` `Adjacent sequences: A094117 A094118 A094119 this_sequence A094121 A094122 A094123`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 03 2004`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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