1,3
Equals (b(n+2)-b(n+1))/2, where b(*) is A007952.
Sequence in context: A181733 A049773 A123021 * A204539 A106466 A130722
Adjacent sequences: A028911 A028912 A028913 * A028915 A028916 A028917
nonn
N. J. A. Sloane (njas(AT)research.att.com).
Offset corrected by Arkadiusz Wesolowski, Aug 12 2011