a(n) = n^3 - 8.

Terms

a(0) =-8a(1) =-7a(2) =0a(3) =19a(4) =56a(5) =117a(6) =208a(7) =335a(8) =504a(9) =721a(10) =992a(11) =1323a(12) =1720a(13) =2189a(14) =2736a(15) =3367a(16) =4088a(17) =4905a(18) =5824a(19) =6851a(20) =7992a(21) =9253a(22) =10640a(23) =12159a(24) =13816a(25) =15617a(26) =17568a(27) =19675a(28) =21944a(29) =24381