a(n) = n^5 + n^3.

Terms

a(0) =0a(1) =2a(2) =40a(3) =270a(4) =1088a(5) =3250a(6) =7992a(7) =17150a(8) =33280a(9) =59778a(10) =101000a(11) =162382a(12) =250560a(13) =373490a(14) =540568a(15) =762750a(16) =1052672a(17) =1424770a(18) =1895400a(19) =2482958a(20) =3208000a(21) =4093362a(22) =5164280a(23) =6448510a(24) =7976448a(25) =9781250a(26) =11898952a(27) =14368590a(28) =17232320a(29) =20535538