A Kutz sequence.

Terms

a(0) =1a(1) =4a(2) =9a(3) =1a(4) =4a(5) =9a(6) =16a(7) =4a(8) =9a(9) =16a(10) =25a(11) =9a(12) =16a(13) =25a(14) =36a(15) =16a(16) =25a(17) =36a(18) =49a(19) =25a(20) =36a(21) =49a(22) =64a(23) =36a(24) =49a(25) =64a(26) =81a(27) =49a(28) =64a(29) =81