25482

Appears in sequences

• Number of n-bead necklaces (turning over is allowed) where complements are equivalent.at n=21A000011
• Number of self-dual 2-colored necklaces with 2n beads.at n=20A007147
• Bisection of A000011.at n=10A092668
• a(n) equals the (n*(n+1)/2)-th partial sum of the self-convolution cube of A010054, which has the g.f.: Sum_{k>=0} x^(k*(k+1)/2).at n=36A109414
• Expansion of Product_{k >= 0} (1 + A147954(k)*x^k).at n=33A147955
• Volume of right circular cone (rounded down) with the diameter of base and height equal to n.at n=45A228189
• a(n) = 3*(n+1)*(9*n+4).at n=30A304503
• Table read by downward antidiagonals: T(n,k) is the number of tilings of the n X k torus up to horizontal and vertical reflections by a tile that is fixed under 180-degree rotations but not horizontal or vertical reflections.at n=38A368303
• Table read by downward antidiagonals: T(n,k) is the number of tilings of the n X k torus up to horizontal and vertical reflections by a tile that is fixed under 180-degree rotations but not horizontal or vertical reflections.at n=42A368303