OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..32
MATHEMATICA
NestList[FromDigits[IntegerDigits[#, 4], 6]&, 4, 20] (* Harvey P. Dale, Apr 14 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(19) from Vincenzo Librandi, Apr 15 2014
STATUS
approved