a(n) = 8*n^2 - 7*n + 1.

Terms

a(0) =1a(1) =2a(2) =19a(3) =52a(4) =101a(5) =166a(6) =247a(7) =344a(8) =457a(9) =586a(10) =731a(11) =892a(12) =1069a(13) =1262a(14) =1471a(15) =1696a(16) =1937a(17) =2194a(18) =2467a(19) =2756a(20) =3061a(21) =3382a(22) =3719a(23) =4072a(24) =4441a(25) =4826a(26) =5227a(27) =5644a(28) =6077a(29) =6526