O.g.f.: Sum_{n>=0} n^n * (1+n*x)^n * x^n/n! * exp(-n*x*(1+n*x)).
A218670
O.g.f.: Sum_{n>=0} n^n * (1+n*x)^n * x^n/n! * exp(-n*x*(1+n*x)).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =26a(5) =116a(6) =556a(7) =2927a(8) =16388a(9) =97666a(10) =612136a(11) =4023878a(12) =27579410a(13) =196537134a(14) =1451102836a(15) =11074811191a(16) =87160086800a(17) =706055915318
External references
- oeis: A218670