a(n) = Sum_{k=0..floor(n/3)} (n-3*k)^n.
A353015
a(n) = Sum_{k=0..floor(n/3)} (n-3*k)^n.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =27a(4) =257a(5) =3157a(6) =47385a(7) =839928a(8) =17168097a(9) =397517868a(10) =10283523826a(11) =293950435376
External references
- oeis: A353015