a(n) = n*(24*n^3 - 60*n^2 + 54*n - 17).

Terms

a(0) =0a(1) =1a(2) =86a(3) =759a(4) =3100a(5) =8765a(6) =19986a(7) =39571a(8) =70904a(9) =117945a(10) =185230a(11) =277871a(12) =401556a(13) =562549a(14) =767690a(15) =1024395a(16) =1340656a(17) =1725041a(18) =2186694a(19) =2735335a(20) =3381260a(21) =4135341a(22) =5009026a(23) =6014339a(24) =7163880a(25) =8470825a(26) =9948926a(27) =11612511a(28) =13476484a(29) =15556325