173502

Appears in sequences

• Number of distributive lattices; also number of paths with n turns when light is reflected from 8 glass plates.at n=7A030112
• Expansion of (1 + 26*x + 109*x^2 + 109*x^3 + 26*x^4 + x^5) / (1 - x)^8.at n=7A244881
• a(n) = A050446(n, n) = A050447(n, n).at n=7A373659
• Triangle read by rows: T(n, k) = (-1)^k*binomial(n, k) * A050446(n, n - k).at n=28A373660