O.g.f.: A(x) = Sum_{n>=0} n^n*x^n/(1-n*x)^(2*n)/n! * exp(-n*x/(1-n*x)^2).
A218680
O.g.f.: A(x) = Sum_{n>=0} n^n*x^n/(1-n*x)^(2*n)/n! * exp(-n*x/(1-n*x)^2).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =16a(4) =111a(5) =911a(6) =8622a(7) =91414a(8) =1067579a(9) =13564195a(10) =185687381a(11) =2718184470a(12) =42288343176a(13) =695667651368
External references
- oeis: A218680