519680

Appears in sequences

• Number of ways to place 2 nonattacking knights on an n X n toroidal board.at n=31A172529
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 606", based on the 5-celled von Neumann neighborhood.at n=18A289892
• Expansion of e.g.f. (1/x) * Series_Reversion( x/(1 + x*exp(x^3/6)) ).at n=8A370926
• a(n) = 2^(2*n - 1) - 2^(n - 1)*(n - 1).at n=10A376585