1068832domain: NAppears in sequencesA(x) satisfies A000290(x)/x^2 = A(x)/A(x^2); A000290 = integer squares.at n=27A173277Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.at n=31A209486