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

Terms

a(0) =1a(1) =121a(2) =441a(3) =961a(4) =1681a(5) =2601a(6) =3721a(7) =5041a(8) =6561a(9) =8281a(10) =10201a(11) =12321a(12) =14641a(13) =17161a(14) =19881a(15) =22801a(16) =25921a(17) =29241a(18) =32761a(19) =36481a(20) =40401a(21) =44521a(22) =48841a(23) =53361a(24) =58081a(25) =63001a(26) =68121a(27) =73441a(28) =78961a(29) =84681