a(n) = n^2 with each digit repeated.

Terms

a(0) =11a(1) =44a(2) =99a(3) =1166a(4) =2255a(5) =3366a(6) =4499a(7) =6644a(8) =8811a(9) =110000a(10) =112211a(11) =114444a(12) =116699a(13) =119966a(14) =222255a(15) =225566a(16) =228899a(17) =332244a(18) =336611a(19) =440000a(20) =444411a(21) =448844a(22) =552299a(23) =557766a(24) =662255a(25) =667766a(26) =772299a(27) =778844a(28) =884411a(29) =990000