a(n) = binomial(4*n - 1, 2*n - 1)*hypergeom([-n, -n + 1/2], [2*n + 1], 4).

A344395

a(n) = binomial(4*n - 1, 2*n - 1)*hypergeom([-n, -n + 1/2], [2*n + 1], 4).

Terms

    a(0) =1a(1) =5a(2) =133a(3) =4037a(4) =129285a(5) =4266830a(6) =143567173a(7) =4896136845a(8) =168640510725

External references