a(n) = (7*n)!*(n/2)!/((7*n/2)!*(n)!*(3*n)!).
A364520
a(n) = (7*n)!*(n/2)!/((7*n/2)!*(n)!*(3*n)!).
Terms
- a(0) =1a(1) =64a(2) =12012a(3) =2621440a(4) =608435100a(5) =146028888064
External references
- oeis: A364520
A364520
a(n) = (7*n)!*(n/2)!/((7*n/2)!*(n)!*(3*n)!).