G.f.: A(x) = Sum_{n>=0} x^n * A(x)^A006068(n) where A006068 forms the inverse permutation of the binary Gray code numbers (A003188).

A204686

G.f.: A(x) = Sum_{n>=0} x^n * A(x)^A006068(n) where A006068 forms the inverse permutation of the binary Gray code numbers (A003188).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =62a(6) =228a(7) =869a(8) =3410a(9) =13663a(10) =55689a(11) =230276a(12) =963851a(13) =4076429a(14) =17394641a(15) =74798044a(16) =323797908a(17) =1409980003a(18) =6171824159a(19) =27141256911a(20) =119854448404a(21) =531261779875

External references