a(n) = 2*n^3 - 3*n^2 + 5.

Terms

a(0) =5a(1) =4a(2) =9a(3) =32a(4) =85a(5) =180a(6) =329a(7) =544a(8) =837a(9) =1220a(10) =1705a(11) =2304a(12) =3029a(13) =3892a(14) =4905a(15) =6080a(16) =7429a(17) =8964a(18) =10697a(19) =12640a(20) =14805a(21) =17204a(22) =19849a(23) =22752a(24) =25925a(25) =29380a(26) =33129a(27) =37184a(28) =41557a(29) =46260