a(n) = concatenation of n^2 with itself.

Terms

a(0) =11a(1) =44a(2) =99a(3) =1616a(4) =2525a(5) =3636a(6) =4949a(7) =6464a(8) =8181a(9) =100100a(10) =121121a(11) =144144a(12) =169169a(13) =196196a(14) =225225a(15) =256256a(16) =289289a(17) =324324a(18) =361361a(19) =400400a(20) =441441a(21) =484484a(22) =529529a(23) =576576a(24) =625625a(25) =676676a(26) =729729a(27) =784784a(28) =841841a(29) =900900