G.f. satisfies A(x) = ( 1 + x * A(x) * (1 + A(x)) )^2.
A371693
G.f. satisfies A(x) = ( 1 + x * A(x) * (1 + A(x)) )^2.
Terms
- a(0) =1a(1) =4a(2) =28a(3) =248a(4) =2480a(5) =26688a(6) =301648a(7) =3531424a(8) =42449088a(9) =520858496a(10) =6497190528a(11) =82146802944
External references
- oeis: A371693