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a(1)=1, a(2)=2, a(n) = a(n-1) + 1 - 2*sign(a(n-2)) for n>2.

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1, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3, 2, 1, 0, -1, 0, 3, 4, 3 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`The sequence has period 8 except for the first term.`
	REFERENCES	`Marius-F. Danca, Contributions to the Theory of Discontinuous Dynamical System, Thesis 2002, University Babes-Bolyai, Cluj, Romania, page 5`
	EXAMPLE	`a(3)=2+1-2sign(1)=1. a(4)=1+1-2sign(2)=0.`
	MATHEMATICA	`a[1]=1; a[2]=2; a[n_] := a[n]=a[n-1]+1-2Sign[a[n-2]]`
	CROSSREFS	`Sequence in context: A116675 A123022 A072943 this_sequence A092147 A016102 A083905` `Adjacent sequences: A072172 A072173 A072174 this_sequence A072176 A072177 A072178`
	KEYWORD	`sign`
	AUTHOR	`Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 29 2002`
	EXTENSIONS	`Edited by Dean Hickerson (dean(AT)math.ucdavis.edu), Jul 31 2002`

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

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