a(n) = 16n^2 + n.

Terms

a(0) =17a(1) =66a(2) =147a(3) =260a(4) =405a(5) =582a(6) =791a(7) =1032a(8) =1305a(9) =1610a(10) =1947a(11) =2316a(12) =2717a(13) =3150a(14) =3615a(15) =4112a(16) =4641a(17) =5202a(18) =5795a(19) =6420a(20) =7077a(21) =7766a(22) =8487a(23) =9240a(24) =10025a(25) =10842a(26) =11691a(27) =12572a(28) =13485a(29) =14430