a(n) = (6*n)!/((4*n)!*n!) * (n/2)!/(3*n/2)!.
A347856
a(n) = (6*n)!/((4*n)!*n!) * (n/2)!/(3*n/2)!.
Terms
- a(0) =1a(1) =20a(2) =990a(3) =56576a(4) =3432198a(5) =215147520a(6) =13768454700a(7) =893768826880
External references
- oeis: A347856
A347856
a(n) = (6*n)!/((4*n)!*n!) * (n/2)!/(3*n/2)!.