Spironacci-style recurrence: a(0)=0, a(1)=1, a(n) = 2*a(n) XOR a(A265409(n)).

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =32a(7) =64a(8) =129a(9) =259a(10) =519a(11) =1036a(12) =2074a(13) =4150a(14) =8296a(15) =16600a(16) =33208a(17) =66424a(18) =132832a(19) =265696a(20) =531424a(21) =1062880a(22) =2125696a(23) =4251521a(24) =8502785a(25) =17005825a(26) =34011905a(27) =68023301a(28) =136047622a(29) =272093206