a(n) = Sum_{k=0..n} (3*k+2) * binomial(5*n-2*k+2,n-k)/(5*n-2*k+2).
A390798
a(n) = Sum_{k=0..n} (3*k+2) * binomial(5*n-2*k+2,n-k)/(5*n-2*k+2).
Terms
- a(0) =1a(1) =3a(2) =17a(3) =124a(4) =1030a(5) =9251a(6) =87517a(7) =859099a(8) =8669363a(9) =89378119a(10) =937338385a(11) =9968284525a(12) =107246775281
External references
- oeis: A390798