1879631domain: NAppears in sequencesNumber of positions that are exactly n moves from the starting position in the Halpern-Meier Pyramid puzzle.at n=9A079746G.f. = continued fraction: A(x)=1/(1-x-x^2-x^3/(1-x^4-x^5-x^6/(1-x^7-x^8-x^9/(...)))).at n=24A088353