G.f. satisfies: A(x) = Sum_{n>=0} x^n*[Sum_{k=0..n} C(n,k)^3 *x^k* A(x)^(3k)].
A187001
G.f. satisfies: A(x) = Sum_{n>=0} x^n*[Sum_{k=0..n} C(n,k)^3 *x^k* A(x)^(3k)].
Terms
- a(0) =1a(1) =1a(2) =2a(3) =12a(4) =62a(5) =300a(6) =1635a(7) =9413a(8) =54505a(9) =321655a(10) =1938621a(11) =11834305a(12) =72975115a(13) =454385175a(14) =2852742151a(15) =18034439209a(16) =114709370133a(17) =733605250447
External references
- oeis: A187001