OFFSET
1,1
FORMULA
a(n) = 2 * A008846(n). [From N. J. A. Sloane, Feb 24 2009]
CROSSREFS
KEYWORD
nonn
AUTHOR
Knut Angstrom (angstrom.knut(AT)telia.com), Feb 22 2009
EXTENSIONS
Edited and extended by Max Alekseyev, Apr 22 2010
STATUS
approved