67912domain: NAppears in sequencesBoustrophedon transform of 1,1,2,3,4,5,...at n=9A000660Expansion of Sum_{i>=1} mu(i)^2*x^i/(1 - x^i) * Product_{j=1..i} 1/(1 - mu(j)^2*x^j), where mu() is the Moebius function (A008683).at n=52A284835