OFFSET
1,1
COMMENTS
FORMULA
a(n) = (1 + A139224(n))/2. - Omar E. Pol, May 22 2017
EXAMPLE
a(1) = -3+4-5+6 = 2. a(2) = -7+8-9+10-11+12-13+14-15+16-17+...-27+28 = 11.
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Juri-Stepan Gerasimov, Jul 21 2009
EXTENSIONS
Edited and extended by R. J. Mathar, Sep 16 2009
STATUS
approved