a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k)^(k+1) * n/(n-k).
A181071
a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k)^(k+1) * n/(n-k).
Terms
- a(0) =1a(1) =3a(2) =7a(3) =15a(4) =66a(5) =357a(6) =1891a(7) =20559a(8) =257605a(9) =3436908a(10) =96199478a(11) =2734569969a(12) =96260508267
External references
- oeis: A181071