a(n)=0!*1!*2!*3!*4!*(5*n)!*10*n*(n-1) / ((n)!*(n+1)!*(n+2)!*(n+3)!*(n+4)!).
A181203
a(n)=0!*1!*2!*3!*4!*(5*n)!*10*n*(n-1) / ((n)!*(n+1)!*(n+2)!*(n+3)!*(n+4)!).
Terms
- a(0) =0a(1) =840a(2) =360360a(3) =199536480a(4) =140229804000
External references
- oeis: A181203