a(n) = A016090(n)/2^n.

Terms

a(0) =3a(1) =19a(2) =47a(3) =586a(4) =293a(5) =1709a(6) =55542a(7) =340271a(8) =1537323a(9) =1745224a(10) =39935112a(11) =19967556a(12) =9983778a(13) =2446398139a(14) =22585503757a(15) =57069119066a(16) =333710340783