a(n) = 169*n^2 - 140*n + 29.

Terms

a(0) =58a(1) =425a(2) =1130a(3) =2173a(4) =3554a(5) =5273a(6) =7330a(7) =9725a(8) =12458a(9) =15529a(10) =18938a(11) =22685a(12) =26770a(13) =31193a(14) =35954a(15) =41053a(16) =46490a(17) =52265a(18) =58378a(19) =64829a(20) =71618a(21) =78745a(22) =86210a(23) =94013a(24) =102154a(25) =110633a(26) =119450a(27) =128605a(28) =138098a(29) =147929