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a(n+1) = a(n) converted to base 6 from base 3 (written in base 10).
1

%I #12 Oct 25 2016 06:12:06

%S 3,6,12,42,264,7854,1742340,13193757150,23257794237223260,

%T 335898688241823720134366994,

%U 8741068101725985426803544574993582139663040,10804929509114651140815139777774933903800232548407116235780609072606838

%N a(n+1) = a(n) converted to base 6 from base 3 (written in base 10).

%H John Cerkan, <a href="/A023369/b023369.txt">Table of n, a(n) for n = 1..17</a>

%t NestList[FromDigits[IntegerDigits[#,3],6]&,3,12] (* _Harvey P. Dale_, Feb 06 2015 *)

%K nonn,base

%O 1,1

%A _David W. Wilson_