7175547

Appears in sequences

• Bending a piece of wire of length n+1 (configurations that can only be brought into coincidence by turning the figure over are counted as different).at n=15A001444
• a(n) = 3^n*(3^(n+1)+1)/2.at n=7A051407
• a(n) = n^7*(n^8 + 1)/2.at n=3A168665
• Dirichlet g.f.: Product_{k>=2} 1 / (1 - k^(-s))^(k^7).at n=8A343287
• Cogrowth sequence of the 18-element group S3 X C3 = <S,T,U | S^3, T^2, U^3, (ST)^2, [S,U], [T,U]>.at n=17A378109