a(n) = n! * Sum_{k=0..floor(n/2)} (k+1)^(k-1) / (k! * (n-2*k)!).
A362522
a(n) = n! * Sum_{k=0..floor(n/2)} (k+1)^(k-1) / (k! * (n-2*k)!).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =49a(5) =201a(6) =2491a(7) =14743a(8) =266337a(9) =2055889a(10) =49051891a(11) =466650471a(12) =13873711633a(13) =156839920537
External references
- oeis: A362522