a(n)^2 is smallest square beginning with n.

Terms

a(0) =0a(1) =1a(2) =5a(3) =6a(4) =2a(5) =23a(6) =8a(7) =27a(8) =9a(9) =3a(10) =10a(11) =34a(12) =11a(13) =37a(14) =12a(15) =39a(16) =4a(17) =42a(18) =43a(19) =14a(20) =45a(21) =46a(22) =15a(23) =48a(24) =49a(25) =5a(26) =51a(27) =52a(28) =17a(29) =54