G.f. A(x) satisfies: 1 + 4x = Sum_{n>=0} x^n * [y^n] A(y)^{2^n}, so that the coefficient of y^n in the (2^n)-th power of A(y) is zero for n>1.
A136639
G.f. A(x) satisfies: 1 + 4x = Sum_{n>=0} x^n * [y^n] A(y)^{2^n}, so that the coefficient of y^n in the (2^n)-th power of A(y) is zero for n>1.
Terms
- a(0) =1a(1) =2a(2) =-6a(3) =28a(4) =-410a(5) =-40548a(6) =-25678044a(7) =-46695237064
External references
- oeis: A136639