OFFSET
0,12
EXAMPLE
G.f.: 1 - x + x^2 - x^3 + x^4 - x^5 + x^6 - x^7 + x^8 - x^10 + 2*x^11 - 3*x^12 + ...
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Aug 19 2017
STATUS
approved