1577984domain: NAppears in sequencesCoefficient of x in the reduction (by x^2->x+1) of polynomial p(n,x) identified in Comments.at n=11A192351Number of length 1+4 0..n arrays with no consecutive five elements summing to more than 2*n.at n=21A241937Expansion of e.g.f. arcsin(x)*exp(x).at n=11A291482