a(n) = 6*n^2 + 3*n + 1.

Terms

a(0) =1a(1) =10a(2) =31a(3) =64a(4) =109a(5) =166a(6) =235a(7) =316a(8) =409a(9) =514a(10) =631a(11) =760a(12) =901a(13) =1054a(14) =1219a(15) =1396a(16) =1585a(17) =1786a(18) =1999a(19) =2224a(20) =2461a(21) =2710a(22) =2971a(23) =3244a(24) =3529a(25) =3826a(26) =4135a(27) =4456a(28) =4789a(29) =5134