a(n) = Sum_{k=0..floor(n/3)} (n-3*k)^(n-3*k).
A353018
a(n) = Sum_{k=0..floor(n/3)} (n-3*k)^(n-3*k).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =28a(4) =257a(5) =3129a(6) =46684a(7) =823800a(8) =16780345a(9) =387467173a(10) =10000823800a(11) =285328450956
External references
- oeis: A353018