278656

Appears in sequences

• Expansion of e.g.f.: tanh(x)/(1+x).at n=9A009838
• Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.at n=10A121138
• a(n) = (n^3*a(n-1) - 1)/(n - 1) for n >= 2, with a(0) = 1, a(1) = 4.at n=5A141827
• Number of nonequivalent ways to place n nonattacking kings on a 2 X 2n chessboard under all symmetry operations of the rectangle.at n=15A322284
• Number of non-unitary square divisors of n!.at n=46A375188
• Number of non-unitary square divisors of n!.at n=47A375188