G.f.: A(x) = exp( 2*Sum_{n>=1} 2^[A007814(n)^2] * x^n/n ), where A007814(n) = exponent of highest power of 2 dividing n.
A162580
G.f.: A(x) = exp( 2*Sum_{n>=1} 2^[A007814(n)^2] * x^n/n ), where A007814(n) = exponent of highest power of 2 dividing n.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =6a(4) =16a(5) =26a(6) =44a(7) =62a(8) =240a(9) =418a(10) =756a(11) =1094a(12) =2544a(13) =3994a(14) =6556a(15) =9118a(16) =32352a(17) =55586a(18) =99492a(19) =143398a(20) =330000a(21) =516602a(22) =845900a(23) =1175198a(24) =3452112a(25) =5729026a(26) =9953556a(27) =14178086a(28) =31076592a(29) =47975098
External references
- oeis: A162580