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a(n+1) = a(n) converted to base 7 from base 4 (written in base 10).
1

%I #12 Oct 25 2016 11:42:36

%S 4,7,10,16,49,148,742,5938,141808,11802091,4842570841,34593916101529,

%T 5841428292099230860,180784187945837355598287982,

%U 4732398970947497341225017545892387325,1674333602909405576416684722405784994054948834029942

%N a(n+1) = a(n) converted to base 7 from base 4 (written in base 10).

%H John Cerkan, <a href="/A023375/b023375.txt">Table of n, a(n) for n = 1..24</a>

%t NestList[FromDigits[IntegerDigits[#,4],7]&,4,20] (* _Harvey P. Dale_, Jul 11 2014 *)

%K nonn,base

%O 1,1

%A _David W. Wilson_

%E One additional term from _Harvey P. Dale_, Jul 11 2014