198634domain: NAppears in sequencesLeast k such that the first k terms of the Kolakoski sequence (A000002) contain n more 1's than 2's.at n=19A022327a(n) is the number of terms in the expansion of (x+y-z)*(x^2+y^2-z^2)*(x^3+y^3-z^3)*...*(x^n+y^n-z^n).at n=34A086817