a(n) = n! * Sum_{k=0..floor(n/2)} (-1)^k * (k+1)^(k-1) / (k! * (n-2*k)!).
A361916
a(n) = n! * Sum_{k=0..floor(n/2)} (-1)^k * (k+1)^(k-1) / (k! * (n-2*k)!).
Terms
- a(0) =1a(1) =1a(2) =-1a(3) =-5a(4) =25a(5) =161a(6) =-1409a(7) =-12221a(8) =158705a(9) =1733185a(10) =-30136769a(11) =-397326709a(12) =8696945929a(13) =134416055905
External references
- oeis: A361916