a(n) = Sum_{k=0..floor(n/3)} (n-3*k)^(n-2*k).
A353014
a(n) = Sum_{k=0..floor(n/3)} (n-3*k)^(n-2*k).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =27a(4) =257a(5) =3133a(6) =46737a(7) =824568a(8) =16792857a(9) =387700668a(10) =10005768898a(11) =285445966496
External references
- oeis: A353014