a(n) = Sum_{k=0..n-1} binomial(5*k,k) * binomial(5*n-5*k-2,n-k-1).
A386367
a(n) = Sum_{k=0..n-1} binomial(5*k,k) * binomial(5*n-5*k-2,n-k-1).
Terms
- a(0) =0a(1) =1a(2) =13a(3) =163a(4) =2021a(5) =24930a(6) =306655a(7) =3765448a(8) =46182101a(9) =565939603a(10) =6931070490a(11) =84845250370
External references
- oeis: A386367