a(1) = 0, a(2) = 1, and for n > 2, a(n) = 2*a(A252463(n)) + [n == 1 (mod 4)].

Terms

a(0) =0a(1) =1a(2) =2a(3) =2a(4) =5a(5) =4a(6) =10a(7) =4a(8) =5a(9) =10a(10) =20a(11) =8a(12) =41a(13) =20a(14) =8a(15) =8a(16) =83a(17) =10a(18) =166a(19) =20a(20) =21a(21) =40a(22) =332a(23) =16a(24) =11a(25) =82a(26) =8a(27) =40a(28) =665a(29) =16