O.g.f.: Sum_{n>=0} n^n * (1+n*x)^(4*n) * x^n/n! * exp(-n*x*(1+n*x)^4).
A218679
O.g.f.: Sum_{n>=0} n^n * (1+n*x)^(4*n) * x^n/n! * exp(-n*x*(1+n*x)^4).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =31a(4) =273a(5) =2652a(6) =30071a(7) =375628a(8) =5135649a(9) =75945388a(10) =1202006514a(11) =20243446719a(12) =360517872287
External references
- oeis: A218679