a(n) = n! * Sum_{k=0..floor(n/2)} k^k / (k! * (n-2*k)!).
A362347
a(n) = n! * Sum_{k=0..floor(n/2)} k^k / (k! * (n-2*k)!).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =61a(5) =261a(6) =3991a(7) =24403a(8) =524217a(9) =4149001a(10) =114544171a(11) =1111976031a(12) =37492210933a(13) =431097055117
External references
- oeis: A362347