111136

Appears in sequences

• a(n) = Sum_{k = 1..n} floor(2^k / k).at n=19A000801
• Sum of (Gaussian) q-binomial coefficients for q=-19.at n=4A015188
• From the game of Quod: number of "squares" on an n X n array of points with the four corner points deleted.at n=32A124479
• Trajectory of 40 under iteration of the map k -> A087712(k).at n=3A144914
• Numbers n such that 2^n == sigma(n) (mod n).at n=4A275007
• a(n) = n * (7*binomial(n, 2) + 1).at n=32A329530