2332419domain: NAppears in sequencesExpansion of (1 - 4*x + 7*x^2 - 4*x^3 + x^4)/(1 - 7*x + 17*x^2 - 17*x^3 + 7*x^4 - x^5).at n=13A166336Number of n X n symmetric 0..7 arrays with no element equal to the sum or difference mod 8 of any two of its horizontal and vertical neighbors.at n=3A193786