69273669domain: NAppears in sequencesa(n) = 1 + A_n(n), or a(n) = -1 if sequence A_n is not defined up to index n.at n=30A107357Number of subsets (up to cyclic shifts) of the n-th roots of 1 with zero sum.at n=61A164896a(n) = A063776(n) + 1.at n=30A283843