a(0) = 1; a(n) = 2 * Sum_{k=0..n} k * binomial(5*n-3*k,n-k)/(5*n-3*k).
A390715
a(0) = 1; a(n) = 2 * Sum_{k=0..n} k * binomial(5*n-3*k,n-k)/(5*n-3*k).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =16a(4) =113a(5) =923a(6) =8210a(7) =77191a(8) =754533a(9) =7590798a(10) =78076583a(11) =817325680a(12) =8679284686a(13) =93266690776
External references
- oeis: A390715