377739

Appears in sequences

• Number of distributive lattices; also number of paths with n turns when light is reflected from 9 glass plates.at n=7A030113
• Expansion of (1 + 26*x + 109*x^2 + 109*x^3 + 26*x^4 + x^5) / (1 - x)^8.at n=8A244881
• Numbers k such that A064839(k) = A064839(k+1).at n=17A343133