G.f. satisfies: A(x) = 1 + Sum_{n>=0} x^n * (1 - A(x)^(2*n))/(1 - A(x)).
A228907
G.f. satisfies: A(x) = 1 + Sum_{n>=0} x^n * (1 - A(x)^(2*n))/(1 - A(x)).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =114a(5) =598a(6) =3336a(7) =19402a(8) =116302a(9) =713368a(10) =4455650a(11) =28240942a(12) =181180912a(13) =1174280146a(14) =7677229718a(15) =50570040088a(16) =335289825874
External references
- oeis: A228907