a(n) = Sum_{k=0..n} (k+1) * 8^k * binomial(2*n+1,n-k).
A386956
a(n) = Sum_{k=0..n} (k+1) * 8^k * binomial(2*n+1,n-k).
Terms
- a(0) =1a(1) =19a(2) =282a(3) =3763a(4) =47294a(5) =571950a(6) =6733668a(7) =77723187a(8) =883589238a(9) =9924844474a(10) =110396411372
External references
- oeis: A386956