OFFSET
1,1
COMMENTS
There are 4^n/12 + O(1) n-digit terms in this sequence. - Charles R Greathouse IV, Jul 15 2016
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Nov 08 2002
EXTENSIONS
Corrected and extended by Sascha Kurz, Jan 03 2003
Corrected and extended by Don Reble, Nov 20 2006
STATUS
approved