Replace 0 with 0000 in binary representation of n.

Terms

a(0) =1a(1) =16a(2) =3a(3) =256a(4) =33a(5) =48a(6) =7a(7) =4096a(8) =513a(9) =528a(10) =67a(11) =768a(12) =97a(13) =112a(14) =15a(15) =65536a(16) =8193a(17) =8208a(18) =1027a(19) =8448a(20) =1057a(21) =1072a(22) =135a(23) =12288a(24) =1537a(25) =1552a(26) =195a(27) =1792a(28) =225a(29) =240