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

Terms

a(0) =19a(1) =85a(2) =31a(3) =469a(4) =253a(5) =2025a(6) =5995a(7) =4061a(8) =15742a(9) =48061a(10) =8191a(11) =220543a(12) =384766a(13) =3080161a(14) =3272671a(15) =6192631a(16) =8385271a(17) =31453021a(18) =58159102a(19) =249495467a(20) =401469279a(21) =268418041a(22) =134193151a(23) =2885548927a(24) =1610563582a(25) =8589393821a(26) =33280753395a(27) =83751780091a(28) =171658174447