a(n) = n*(n + 6).

Terms

a(0) =0a(1) =7a(2) =16a(3) =27a(4) =40a(5) =55a(6) =72a(7) =91a(8) =112a(9) =135a(10) =160a(11) =187a(12) =216a(13) =247a(14) =280a(15) =315a(16) =352a(17) =391a(18) =432a(19) =475a(20) =520a(21) =567a(22) =616a(23) =667a(24) =720a(25) =775a(26) =832a(27) =891a(28) =952a(29) =1015