a(n) = 10*n^2 - 7*n + 1.

Terms

a(0) =1a(1) =4a(2) =27a(3) =70a(4) =133a(5) =216a(6) =319a(7) =442a(8) =585a(9) =748a(10) =931a(11) =1134a(12) =1357a(13) =1600a(14) =1863a(15) =2146a(16) =2449a(17) =2772a(18) =3115a(19) =3478a(20) =3861a(21) =4264a(22) =4687a(23) =5130a(24) =5593a(25) =6076a(26) =6579a(27) =7102a(28) =7645a(29) =8208