a(n) = n! * Sum_{k=0..floor(n/3)} k^k / (k! * (n-3*k)!).
A362348
a(n) = n! * Sum_{k=0..floor(n/3)} k^k / (k! * (n-3*k)!).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =7a(4) =25a(5) =61a(6) =1561a(7) =10291a(8) =40657a(9) =1754425a(10) =16632721a(11) =90479071a(12) =5469933481a(13) =67591594357a(14) =468224398825
External references
- oeis: A362348