a(n) is the index of the smallest n-gonal number with binary weight n.

Terms

a(0) =6a(1) =13a(2) =9a(3) =10a(4) =24a(5) =58a(6) =34a(7) =55a(8) =67a(9) =151a(10) =134a(11) =187a(12) =201a(13) =691a(14) =350a(15) =623a(16) =1082a(17) =1870a(18) =2302a(19) =3171a(20) =5017a(21) =13863a(22) =13230a(23) =6663a(24) =24357a(25) =50397a(26) =35604a(27) =60347a(28) =63810a(29) =107019