OFFSET
1,1
COMMENTS
Always in the set {-1,0,1,2,3}, but first occurrence of -1 is at n = 2047. - Jeffrey Shallit, Nov 19 2016
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 1..10000
CROSSREFS
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Oct 28 2016
STATUS
approved