a(n) = n^3 - 4*n^2 + 6*n - 2.

Terms

a(0) =7a(1) =22a(2) =53a(3) =106a(4) =187a(5) =302a(6) =457a(7) =658a(8) =911a(9) =1222a(10) =1597a(11) =2042a(12) =2563a(13) =3166a(14) =3857a(15) =4642a(16) =5527a(17) =6518a(18) =7621a(19) =8842a(20) =10187a(21) =11662a(22) =13273a(23) =15026a(24) =16927a(25) =18982a(26) =21197a(27) =23578a(28) =26131a(29) =28862