Expansion of Sum_{n>=0} (3*n)!/n!^3 * x^(2*n)/(1-3*x)^(3*n+1).
A208426
Expansion of Sum_{n>=0} (3*n)!/n!^3 * x^(2*n)/(1-3*x)^(3*n+1).
Terms
- a(0) =1a(1) =3a(2) =15a(3) =99a(4) =711a(5) =5373a(6) =42099a(7) =338355a(8) =2771127a(9) =23028813a(10) =193610385a(11) =1643215005a(12) =14056350075a(13) =121040308665
External references
- oeis: A208426