A155543 a(n)=2*A081294(n).

2, 4, 16, 64, 256, 1024, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216, 67108864, 268435456, 1073741824, 4294967296, 17179869184, 68719476736, 274877906944, 1099511627776, 4398046511104, 17592186044416, 70368744177664

Offset: 0

Author

Paul Curtz, Jan 24 2009

Keywords

• nonn
• easy

Links

• Index entries for linear recurrences with constant coefficients, signature (4).

Programs

Mathematica

CoefficientList[Series[2(1-2x)/(1-4x),{x,0,30}],x] (* or *) Join[{2}, NestList[ 4#&,4,30]] (* Harvey P. Dale, Nov 13 2015 *)

Formula

a(n)=A000302(n), n>0.

G.f.: 2*(1-2*x)/(1-4*x). [R. J. Mathar, Jul 23 2009]

Conjecture: a(n)=A090129(2n+2).

Extensions

Edited and extended by R. J. Mathar, Jul 23 2009