124205

Appears in sequences

• Number of positions that are exactly n moves from the starting position in the Billiards Nine-Ball puzzle.at n=9A079839
• Semiprimes in A103377.at n=23A103397
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.at n=12A146052