116494domain: NAppears in sequencesExpansion of g.f. (1-x-x^3+x^4-2*x^2)/((1-2*x)*(x-1)^2*(x+1)^2).at n=20A106157Expansion of Product_{k>=1} (1 + x^k)^(binomial(2*k,k)/(k+1)).at n=11A304787