a(n) = n! * Sum_{k=0..floor(n/5)} (-n)^k / (k! * (n-5*k)!).
A362324
a(n) = n! * Sum_{k=0..floor(n/5)} (-n)^k / (k! * (n-5*k)!).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =-599a(6) =-4319a(7) =-17639a(8) =-53759a(9) =-136079a(10) =181137601a(11) =2414356561a(12) =17242917121a(13) =87695201881a(14) =355974659041
External references
- oeis: A362324