a(n) = Sum_{k=1..n+1} (-1)^(k - 1)*(k + 1)*(n - k + 1)!.
A374652
a(n) = Sum_{k=1..n+1} (-1)^(k - 1)*(k + 1)*(n - k + 1)!.
Terms
- a(0) =-1a(1) =5a(2) =5a(3) =39a(4) =181a(5) =1159a(6) =8301a(7) =67919a(8) =621941a(9) =6308679a(10) =70223101a(11) =851165119a(12) =11160489861a(13) =157411458359
External references
- oeis: A374652