1,4

a(1)=0; a(2n)=a(2n+1)=2a(n) if A007814(n) is even, a(2n)=a(2n+1)+1=2a(n)+3 if A007814(n) is odd.

a(2)=2a(1)=0; a(3)=2a(1)=0; a(4)=2a(2)+3=3; a(5)=2a(2)+2=2.

Cf. A004760 A160217 A007814

Sequence in context: A062787 A131370 A062707 this_sequence A059033 A133209 A144553

Adjacent sequences: A160227 A160228 A160229 this_sequence A160231 A160232 A160233

nonn

Vladimir Shevelev (shevelev(AT)bgu.ac.il), May 04 2009

Edited by N. J. A. Sloane, May 08 2009