a(n) = Sum_{k=0..floor(n/2)} (n-2*k)^(n-k).
A353013
a(n) = Sum_{k=0..floor(n/2)} (n-2*k)^(n-k).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =28a(4) =264a(5) =3207a(6) =47696a(7) =839412a(8) =17061280a(9) =393264145a(10) =10135913792a(11) =288839201432
External references
- oeis: A353013