208658domain: NAppears in sequencesNumber of nX4 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.at n=7A209370Expansion of Sum_{i>=1} mu(i)^2*x^i/(1 - x^i) * Product_{j>=i} 1/(1 - mu(j)^2*x^j), where mu() is the Moebius function (A008683).at n=48A284829