3302155domain: NAppears in sequencesNumber of n-bead necklaces labeled with numbers -1..1 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.at n=19A209108Values of x such that x^2 + y^2 = 61^n with x and y coprime and 0 < x < y.at n=8A230841