a(n) = Sum_{k=0..floor(n/2)} (n-2*k)^n.
A352082
a(n) = Sum_{k=0..floor(n/2)} (n-2*k)^n.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =28a(4) =272a(5) =3369a(6) =50816a(7) =903856a(8) =18522624a(9) =429746905a(10) =11135257600a(11) =318719062236
External references
- oeis: A352082