a(n) = 7*n^2 + 14*n + 1.

Terms

a(0) =1a(1) =22a(2) =57a(3) =106a(4) =169a(5) =246a(6) =337a(7) =442a(8) =561a(9) =694a(10) =841a(11) =1002a(12) =1177a(13) =1366a(14) =1569a(15) =1786a(16) =2017a(17) =2262a(18) =2521a(19) =2794a(20) =3081a(21) =3382a(22) =3697a(23) =4026a(24) =4369a(25) =4726a(26) =5097a(27) =5482a(28) =5881a(29) =6294