-111818026018domain: ZAppears in sequencesExpansion of (1-x+sqrt(1-6x+x^2))/2 in powers of x.at n=18A085403Expansion of (1 + x + sqrt(1 - 6*x + x^2))/2 in powers of x.at n=18A086456Expansion of (1 + x + sqrt(1 + 6*x + x^2))/2.at n=18A112478