Positions of squares in A259934.

Terms

a(0) =0a(1) =21a(2) =24a(3) =8504a(4) =9860a(5) =28022a(6) =28171a(7) =106666a(8) =106957a(9) =1301664a(10) =1310231a(11) =2736338a(12) =2740428a(13) =8770047a(14) =8829795a(15) =333863896a(16) =333959486