a(n) = Sum_{k=0..n} 2^(n-k) * binomial(4*n+1,k) * binomial(4*n-k-1,n-k).
A386864
a(n) = Sum_{k=0..n} 2^(n-k) * binomial(4*n+1,k) * binomial(4*n-k-1,n-k).
Terms
- a(0) =1a(1) =11a(2) =228a(3) =5350a(4) =132476a(5) =3380955a(6) =87974188a(7) =2320223552a(8) =61804459260
External references
- oeis: A386864