27012

Appears in sequences

• Number of necklaces with n beads of 2 colors, allowing turning over (these are also called bracelets).at n=20A000029
• Numbers that are the sum of 7 nonzero 8th powers.at n=29A003385
• Number of products of factorials not exceeding n!.at n=24A101976
• Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=7A207113
• Number of n-bead necklaces of 3 colors allowing reversal, with no adjacent beads having the same color.at n=19A208539
• Table read by antidiagonals: T(n,k) is the number of tilings of the n X k torus up to 180-degree rotation by two tiles that are both fixed under 180-degree rotation.at n=31A368307
• Table read by antidiagonals: T(n,k) is the number of tilings of the n X k torus up to 180-degree rotation by two tiles that are both fixed under 180-degree rotation.at n=32A368307