a(n) = n*(2*n+5)*(2*n+7).

Terms

a(0) =0a(1) =63a(2) =198a(3) =429a(4) =780a(5) =1275a(6) =1938a(7) =2793a(8) =3864a(9) =5175a(10) =6750a(11) =8613a(12) =10788a(13) =13299a(14) =16170a(15) =19425a(16) =23088a(17) =27183a(18) =31734a(19) =36765a(20) =42300a(21) =48363a(22) =54978a(23) =62169a(24) =69960a(25) =78375a(26) =87438a(27) =97173a(28) =107604a(29) =118755