a(n) = n! * Sum_{k=0..floor(n/2)} n^k * binomial(n-k,k)/(n-k)!.
A362281
a(n) = n! * Sum_{k=0..floor(n/2)} n^k * binomial(n-k,k)/(n-k)!.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =241a(5) =1601a(6) =32581a(7) =308995a(8) =8655809a(9) =106673761a(10) =3805452901a(11) =57704760851
External references
- oeis: A362281