a(n) = Sum_{k=0..n} 2^k * binomial(4*n,k) * binomial(4*n-k-1,n-k).
A386719
a(n) = Sum_{k=0..n} 2^k * binomial(4*n,k) * binomial(4*n-k-1,n-k).
Terms
- a(0) =1a(1) =11a(2) =229a(3) =5381a(4) =133333a(5) =3404156a(6) =88600483a(7) =2337160718a(8) =62263902037
External references
- oeis: A386719