a(n) = coefficient of x^n in the (2^(n+1))-th iteration of x+x^2 for n>=1.
A158263
a(n) = coefficient of x^n in the (2^(n+1))-th iteration of x+x^2 for n>=1.
Terms
- a(0) =1a(1) =8a(2) =240a(3) =30256a(4) =15665664a(5) =32668147008
External references
- oeis: A158263