a(n) = (5/7) * (9*n)!*(7*n/2)!^2/((9*n/2)!*(7*n)!*(5*n/2)!*n!^2) for n >= 1, with a(0) = 1.
A364517
a(n) = (5/7) * (9*n)!*(7*n/2)!^2/((9*n/2)!*(7*n)!*(5*n/2)!*n!^2) for n >= 1, with a(0) = 1.
Terms
- a(0) =1a(1) =40a(2) =7650a(3) =1847560a(4) =494944450a(5) =140625140040
External references
- oeis: A364517