id:A127365 - OEIS Search Results

Search: id:A127365

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Signed repeated natural numbers.

+0
2

0, 0, -1, -1, 2, 2, -3, -3, 4, 4, -5, -5, 6, 6, -7, -7, 8, 8, -9, -9, 10, 10, -11, -11, 12, 12, -13, -13, 14, 14, -15, -15, 16, 16, -17, -17, 18, 18, -19, -19, 20, 20, -21, -21, 22, 22, -23, -23, 24, 24, -25, -25, 26, 26 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`Hankel transform of A093387.`
	FORMULA	`G.f.: -x^2(1+x)/(1+x^2)^2; a(n)=floor(n/2)(sin(npi/2)+cos(npi/2)).`
	CROSSREFS	`Sequence in context: A086388 A080513 A111660 this_sequence A065033 A001057 A130472` `Adjacent sequences: A127362 A127363 A127364 this_sequence A127366 A127367 A127368`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 11 2007`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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