a(n) is the number whose base-(n+1) expansion equals the binary expansion of n.

Terms

a(0) =1a(1) =3a(2) =5a(3) =25a(4) =37a(5) =56a(6) =73a(7) =729a(8) =1001a(9) =1342a(10) =1741a(11) =2366a(12) =2941a(13) =3615a(14) =4369a(15) =83521a(16) =104977a(17) =130340a(18) =160021a(19) =194922a(20) =234741a(21) =280393a(22) =332377a(23) =406250a(24) =474553a(25) =551151a(26) =636637a(27) =732511a(28) =837901a(29) =954304