Binomial coefficient C(4n,n-5).

Terms

a(0) =1a(1) =24a(2) =378a(3) =4960a(4) =58905a(5) =658008a(6) =7059052a(7) =73629072a(8) =752538150a(9) =7575968400a(10) =75394027566a(11) =743595781824