a(n) = Sum_{i=1..n} C(i+4,5)^3.

Terms

a(0) =1a(1) =217a(2) =9478a(3) =185094a(4) =2185470a(5) =18188478a(6) =116799606a(7) =613592694a(8) =2745339597a(9) =10769363605a(10) =37850444632a(11) =121189368664a(12) =358136205336a(13) =987118431768