26585

Appears in sequences

• Number of distributive lattices; also number of paths with n turns when light is reflected from 6 glass plates.at n=7A006359
• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 21 (most significant digit on right).at n=13A061950
• Expansion of (1 + 26*x + 109*x^2 + 109*x^3 + 26*x^4 + x^5) / (1 - x)^8.at n=5A244881
• Number of up-down sequences of length n and values in {1,2,...,n}.at n=7A276312
• Odd numbers k such that A292270((k-1)/2) is a square < ((k-1)/2)^2.at n=24A292379
• Primitive terms of A338890.at n=38A338892