51987

Appears in sequences

• Number of black-and-white colored (or proper magnetic) space groups in dimension n, not counting enantiomorphs.at n=4A307292
• Place n points in general position on each side of an equilateral triangle, and join every pair of the 3*n+3 boundary points by a chord; sequence gives number of vertices in the resulting planar graph.at n=12A367117