2576795domain: NAppears in sequencesNumber of distributive lattices; also number of paths with n turns when light is reflected from 12 glass plates.at n=7A030116Expansion of (1 + 26*x + 109*x^2 + 109*x^3 + 26*x^4 + x^5) / (1 - x)^8.at n=11A244881