a(n) = coefficient of x^n in the (2^(n-1))-th iteration of x*C(x) where C(x) is the Catalan function (A000108), for n>=1.
A158268
a(n) = coefficient of x^n in the (2^(n-1))-th iteration of x*C(x) where C(x) is the Catalan function (A000108), for n>=1.
Terms
- a(0) =1a(1) =2a(2) =20a(3) =684a(4) =84864a(5) =40783952a(6) =78562790592
External references
- oeis: A158268