A Kutz sequence.

Terms

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