a(n) = exp(1) * Sum_{k>=0} (-1)^k*k^(2*n)/k!.
A308646
a(n) = exp(1) * Sum_{k>=0} (-1)^k*k^(2*n)/k!.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =-9a(4) =50a(5) =413a(6) =-17731a(7) =110176a(8) =9938669a(9) =-278475061a(10) =-9816860358a(11) =725503033401
External references
- oeis: A308646