a(1) = 1; for n > 1, a(n) = 4*a(A252463(n)) + (n mod 4).

Terms

a(0) =1a(1) =6a(2) =27a(3) =24a(4) =109a(5) =110a(6) =439a(7) =96a(8) =97a(9) =438a(10) =1759a(11) =440a(12) =7037a(13) =1758a(14) =443a(15) =384a(16) =28149a(17) =390a(18) =112599a(19) =1752a(20) =1753a(21) =7038a(22) =450399a(23) =1760a(24) =389a(25) =28150a(26) =387a(27) =7032a(28) =1801597a(29) =1774