4868681

Appears in sequences

• a(n) = number of permutations of {1,...,n} which are twice but not 3-times reformable.at n=11A055459
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 563", based on the 5-celled von Neumann neighborhood.at n=25A283046