id:A130472 - OEIS Search Results

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A permutation of the integers: a(n)=((-1)^n)*floor((n+1)/2).

+0
5

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, -27, 27, -28, 28, -29, 29, -30, 30, -31, 31, -32, 32 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`a(n)=-A001057(n); a(2n)=n, a(2n+1)=-n-1; a(n)=sum{k*(-1)^k: k=0,1,...,n}; a(n)=-a(n-1)+a(n-2)+a(n-3).`
	CROSSREFS	`Cf. A001057.` `Sequence in context: A127365 A065033 A001057 this_sequence A004526 A140106 A123108` `Adjacent sequences: A130469 A130470 A130471 this_sequence A130473 A130474 A130475`
	KEYWORD	`sign`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu), May 28 2007`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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