G.f. A(x) satisfies A(x) = (1 + x*A(x*A(x)))^2.
A381568
G.f. A(x) satisfies A(x) = (1 + x*A(x*A(x)))^2.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =22a(4) =126a(5) =884a(6) =7149a(7) =64688a(8) =641836a(9) =6888740a(10) =79203860a(11) =968503090a(12) =12525131474a(13) =170555767116
External references
- oeis: A381568