152497

Appears in sequences

• Strong pseudoprimes to base 54.at n=36A020280
• Isomorphism classes of 2-in 2-out regular digraphs, allowing parallel edges but not loops.at n=10A307180
• Place n points in general position on each side of a square, and join every pair of the 4*n+4 boundary points by a chord; sequence gives number of regions in the resulting planar graph.at n=11A367121