85445domain: NAppears in sequencesNumber of complete mappings f(x) of the cyclic group Z_{2n+1} such that -f(-x)=f.at n=9A071706Expansion of g.f.: 1/((1 - x - x^2 + x^4 - x^6)*(1 - x^2 + x^4 + x^5 - x^6)).at n=28A147606