300048

Appears in sequences

• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (1, 0, 0), (1, 1, -1), (1, 1, 1)}.at n=9A150822
• Numbers other than prime powers divisible by the sum of the squares of their prime divisors.at n=35A190882
• a(n) is the number of rooted 6-regular maps on the Klein bottle with n vertices and 2n edges.at n=2A348812