a(n) = n*(n+7).

Terms

a(0) =0a(1) =8a(2) =18a(3) =30a(4) =44a(5) =60a(6) =78a(7) =98a(8) =120a(9) =144a(10) =170a(11) =198a(12) =228a(13) =260a(14) =294a(15) =330a(16) =368a(17) =408a(18) =450a(19) =494a(20) =540a(21) =588a(22) =638a(23) =690a(24) =744a(25) =800a(26) =858a(27) =918a(28) =980a(29) =1044