a(n) = 3*n^2 - 2*n + 7.

Terms

a(0) =7a(1) =8a(2) =15a(3) =28a(4) =47a(5) =72a(6) =103a(7) =140a(8) =183a(9) =232a(10) =287a(11) =348a(12) =415a(13) =488a(14) =567a(15) =652a(16) =743a(17) =840a(18) =943a(19) =1052a(20) =1167a(21) =1288a(22) =1415a(23) =1548a(24) =1687a(25) =1832a(26) =1983a(27) =2140a(28) =2303a(29) =2472