0,1

a(n)= A002001(n+1)+1. a(n)=4a(n-1)-3.

First differences: a(n+1)-a(n)= A002063(n).

a(n+k)-a(n)= 3*(4^k-1)*A000302(n) = 9*A002450(k)*A000302(n).

a(n)=A140529(n)-A096045(n).

O.g.f.: (7x-4)/((1-x)(4x-1)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 14 2008

Sequence in context: A096971 A149451 A149452 this_sequence A149453 A149454 A101125

Adjacent sequences: A140657 A140658 A140659 this_sequence A140661 A140662 A140663

nonn

Paul Curtz (bpcrtz(AT)free.fr), Jul 10 2008

Edited and extended R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 14 2008