a(n) = 10*n^2 + 5*n + 1.

Terms

a(0) =1a(1) =16a(2) =51a(3) =106a(4) =181a(5) =276a(6) =391a(7) =526a(8) =681a(9) =856a(10) =1051a(11) =1266a(12) =1501a(13) =1756a(14) =2031a(15) =2326a(16) =2641a(17) =2976a(18) =3331a(19) =3706a(20) =4101a(21) =4516a(22) =4951a(23) =5406a(24) =5881a(25) =6376a(26) =6891a(27) =7426a(28) =7981a(29) =8556