OFFSET
1,6
FORMULA
G.f.: x/(1+x-x^3-x^5-x^6-x^7-x^9+x^11+x^12). [R. J. Mathar, Mar 25 2009]
MATHEMATICA
f[x_] = 1 + x - x^3 - x^5 - x^6 - x^7 - x^9 + x^11 + x^12;
g[x] = ExpandAll[x^12*f[1/x]];
Table[SeriesCoefficient[Series[1/g[x], {x, 0, 50}], n], {n, 0, 50}];
CROSSREFS
KEYWORD
sign,easy,less
AUTHOR
Roger L. Bagula and Gary W. Adamson, Oct 26 2008
EXTENSIONS
Better name (using g.f.) from Joerg Arndt, Apr 06 2018
STATUS
approved