a(n) = concatenation of (n times each digit of n).

Terms

a(0) =1a(1) =4a(2) =9a(3) =16a(4) =25a(5) =36a(6) =49a(7) =64a(8) =81a(9) =100a(10) =1111a(11) =1224a(12) =1339a(13) =1456a(14) =1575a(15) =1696a(16) =17119a(17) =18144a(18) =19171a(19) =400a(20) =4221a(21) =4444a(22) =4669a(23) =4896a(24) =50125a(25) =52156a(26) =54189a(27) =56224a(28) =58261a(29) =900