Analog of A097717 in base 4.

Terms

a(0) =1a(1) =18a(2) =279a(3) =4a(4) =68985a(5) =1094166a(6) =49a(7) =264a(8) =1053a(9) =1050a(10) =4191a(12) =65a(13) =266910a(15) =16a(18) =265639a(21) =67880230a(22) =1035a(23) =17360709912a(24) =775