198912

Appears in sequences

• Low-temperature susceptibility expansion for honeycomb net (Potts model, q=4).at n=6A057395
• Numbers k such that phi(k)*sigma(k) is a triangular number.at n=18A115911
• Number of ways to select four points from an n X n grid so that three of them form a triangle of nonzero area and the extra point is on one of the edges of the triangle.at n=8A334713