1,2

a(n) = 2*A008683 - 1, where A008683 = the Mobius sequence.

a(5) = -3 = 2*(-1) - 1.

Cf. A008683.

Sequence in context: A089680 A160326 A123561 this_sequence A138114 A124330 A055177

Adjacent sequences: A133692 A133693 A133694 this_sequence A133696 A133697 A133698

sign

Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 20 2007