Expansion of e.g.f.: 3*exp(3*x) / (4 - exp(3*x)).
A201355
Expansion of e.g.f.: 3*exp(3*x) / (4 - exp(3*x)).
Terms
- a(0) =1a(1) =4a(2) =20a(3) =132a(4) =1140a(5) =12324a(6) =160020a(7) =2424132a(8) =41967540a(9) =817374564a(10) =17688328020a(11) =421061260932
External references
- oeis: A201355