OFFSET
1,2
REFERENCES
J. H. Conway, Posting to Math Fun Mailing List, Dec 02 1996.
FORMULA
a(n) = A220249(n)-1. - R. J. Mathar, May 06 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Mar 07 2016
STATUS
approved