Powers of 2 written in base 7.

Terms

a(0) =1a(1) =2a(2) =4a(3) =11a(4) =22a(5) =44a(6) =121a(7) =242a(8) =514a(9) =1331a(10) =2662a(11) =5654a(12) =14641a(13) =32612a(14) =65524a(15) =164351a(16) =362032a(17) =1054064a(18) =2141161a(19) =4312352a(20) =11625034a(21) =23553101a(22) =50436202a(23) =131205404a(24) =262414111a(25) =555131222a(26) =1443262444a(27) =3216555221a(28) =6436443442a(29) =16206220214