a(n) = (9*n)!*(4*n)!/((8*n)!*(3*n)!*(2*n)!).
A295439
a(n) = (9*n)!*(4*n)!/((8*n)!*(3*n)!*(2*n)!).
Terms
- a(0) =1a(1) =18a(2) =714a(3) =32175a(4) =1531530a(5) =75167268a(6) =3762157035a(7) =190878381495
External references
- oeis: A295439
A295439
a(n) = (9*n)!*(4*n)!/((8*n)!*(3*n)!*(2*n)!).