a(n) = 8*n^2 - 5*n + 1.

Terms

a(0) =1a(1) =4a(2) =23a(3) =58a(4) =109a(5) =176a(6) =259a(7) =358a(8) =473a(9) =604a(10) =751a(11) =914a(12) =1093a(13) =1288a(14) =1499a(15) =1726a(16) =1969a(17) =2228a(18) =2503a(19) =2794a(20) =3101a(21) =3424a(22) =3763a(23) =4118a(24) =4489a(25) =4876a(26) =5279a(27) =5698a(28) =6133a(29) =6584