All terms are squares and a(n) is length of n-th run.

Terms

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