a(n) is the least possible smallest period attainable by the action of a periodic sequence of binary operations <+>,<-> (see A179382,A179480), beginning with 2n-1<+>1 or 2n-1<->1
1, 1, 1, 1, 2, 2, 1, 1, 3, 2,
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Mon Jul 19 10:27:05 CEST 2010 [seqfan] Re: Pseudo-arithmetic progressions