2^n written in base 5.

Terms

a(0) =1a(1) =2a(2) =4a(3) =13a(4) =31a(5) =112a(6) =224a(7) =1003a(8) =2011a(9) =4022a(10) =13044a(11) =31143a(12) =112341a(13) =230232a(14) =1011014a(15) =2022033a(16) =4044121a(17) =13143242a(18) =31342034a(19) =113234123a(20) =232023301a(21) =1014102102a(22) =2033204204a(23) =4121413413a(24) =13243332331a(25) =32042220212a(26) =114134440424a(27) =233324431403