Some permutation of digits is a square.

Terms

a(0) =1a(1) =4a(2) =9a(3) =10a(4) =16a(5) =18a(6) =25a(7) =36a(8) =40a(9) =46a(10) =49a(11) =52a(12) =61a(13) =63a(14) =64a(15) =81a(16) =90a(17) =94a(18) =100a(19) =106a(20) =108a(21) =112a(22) =121a(23) =136a(24) =144a(25) =148a(26) =160a(27) =163a(28) =169a(29) =180