a(n) = n^2 - 2.

Terms

a(0) =-1a(1) =2a(2) =7a(3) =14a(4) =23a(5) =34a(6) =47a(7) =62a(8) =79a(9) =98a(10) =119a(11) =142a(12) =167a(13) =194a(14) =223a(15) =254a(16) =287a(17) =322a(18) =359a(19) =398a(20) =439a(21) =482a(22) =527a(23) =574a(24) =623a(25) =674a(26) =727a(27) =782a(28) =839a(29) =898