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A169636
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Number of permutations of A004001 sequence vectors:a(n)=Length[Permutations[Table[A004001[i], {i, 0, m}]]]
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0
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1, 2, 3, 12, 30, 180, 1260, 5040, 15120, 151200, 1663200
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OFFSET
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0,2
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LINKS
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FORMULA
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f(n) = f(f(n - 1)) + f(n - f(n - 1));
a(n)=Length[Permutations[Table[f(i), {i, 0, m}]]]
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MATHEMATICA
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f[0] = 0; f[1] = 1; f[2] = 1;
f[n_] := f[n] = f[f[n - 1]] + f[n - f[n - 1]];
a[m_] := Length[Permutations[Table[f[i], {i, 0, m}]]];
b = Table[a[m], {m, 0, 10}]
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CROSSREFS
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KEYWORD
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nonn,uned
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AUTHOR
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STATUS
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approved
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