G.f.: A(x) = exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^3 * x^k*A(x)^k] * x^n/n ).
A198944
G.f.: A(x) = exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^3 * x^k*A(x)^k] * x^n/n ).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =23a(5) =78a(6) =291a(7) =1126a(8) =4436a(9) =17910a(10) =73773a(11) =308188a(12) =1303402a(13) =5573133a(14) =24050795a(15) =104620985a(16) =458324429a(17) =2020417339a(18) =8956142180a(19) =39899217350a(20) =178549985024a(21) =802275736073
External references
- oeis: A198944