a(n) = Sum_{k=1..n} binomial(k+2,3) * n^(n-k).
A368535
a(n) = Sum_{k=1..n} binomial(k+2,3) * n^(n-k).
Terms
- a(0) =0a(1) =1a(2) =6a(3) =31a(4) =188a(5) =1510a(6) =16106a(7) =217938a(8) =3577624a(9) =68952495a(10) =1524157870a(11) =37974983321
External references
- oeis: A368535