a(n) = n! * Sum_{k=0..floor(n/3)} (-1)^k * (k+1)^(k-1) / (k! * (n-3*k)!).
A361917
a(n) = n! * Sum_{k=0..floor(n/3)} (-1)^k * (k+1)^(k-1) / (k! * (n-3*k)!).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =-5a(4) =-23a(5) =-59a(6) =961a(7) =7351a(8) =29905a(9) =-877463a(10) =-9450719a(11) =-52724429a(12) =2282907001a(13) =31742360365a(14) =225092745697
External references
- oeis: A361917