A101676 - OEIS

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A101676

a(n)=a(n-1)-a(n-2)+a(n-3)-a(n-4)+a(n-5).

1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2, -1, 0, 0, 1, 0, -2 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`Partial sums of A101675. Partial sums are A101677.` `Sequence has period 6. - Ralf Stephan, May 16 2007`
	FORMULA	`G.f.: (1-x-x^2)/((1-x)(1+x^2+x^4)); a(n)=-cos(2pin/3+pi/3)/3+sin(2pin/3+pi/3)/sqrt(3)+2cos(pi*n/3+pi/6)/sqrt(3)-1/3.`
	CROSSREFS	`Sequence in context: A060564 A031267 A065360 * A056560 A096608 A155102` `Adjacent sequences: A101673 A101674 A101675 * A101677 A101678 A101679`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Dec 11 2004`

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Last modified February 15 04:23 EST 2012. Contains 205694 sequences.