id:A102389 - OEIS Search Results

Search: id:A102389

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An evil count.

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2

1, 0, 0, 2, 0, 3, 4, 0, 0, 5, 6, 0, 7, 0, 0, 8, 0, 9, 10, 0, 11, 0, 0, 12, 13, 0, 0, 14, 0, 15, 16, 0, 0, 17, 18, 0, 19, 0, 0, 20, 21, 0, 0, 22, 0, 23, 24, 0, 25, 0, 0, 26, 0, 27, 28, 0, 0, 29, 30, 0, 31, 0, 0, 32, 0, 33, 34, 0, 35, 0, 0, 36, 37, 0, 0, 38, 0, 39, 40, 0, 41, 0, 0, 42, 0, 43, 44, 0 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Counting numbers appear at positions indexed by the evil numbers A001969, 0 otherwise. A008619(n)=A102389(n)+A102390(n).`
	FORMULA	`a(n)=(1+floor(n/2))(1+(-1)^A000120(n))/2; a(n)=(1+floor(n/2))(1+(-1)^A010060(n))/2.`
	CROSSREFS	`Sequence in context: A021835 A112476 A153250 this_sequence A099091 A078436 A117909` `Adjacent sequences: A102386 A102387 A102388 this_sequence A102390 A102391 A102392`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 06 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research