a(n)=(1/2)*4^n*(2*Gamma(n + 1/2)^2*hypergeom([n + 1/2, n + 1/2], [1/2, 1/2, 3/2], 1/4) + Pi*n!^2*hypergeom([n + 1, n + 1], [1, 3/2, 2], 1/4))/exp(1)/Pi.
A088466
a(n)=(1/2)*4^n*(2*Gamma(n + 1/2)^2*hypergeom([n + 1/2, n + 1/2], [1/2, 1/2, 3/2], 1/4) + Pi*n!^2*hypergeom([n + 1, n + 1], [1, 3/2, 2], 1/4))/exp(1)/Pi.
Terms
- a(0) =2a(1) =43a(2) =2215a(3) =204236a(4) =29238991a(5) =5968183657
External references
- oeis: A088466