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A169636 Number of permutations of A004001 sequence vectors:a(n)=Length[Permutations[Table[A004001[i], {i, 0, m}]]] 0
1, 2, 3, 12, 30, 180, 1260, 5040, 15120, 151200, 1663200 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
f(n) = f(f(n - 1)) + f(n - f(n - 1));
a(n)=Length[Permutations[Table[f(i), {i, 0, m}]]]
MATHEMATICA
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}]
CROSSREFS
Sequence in context: A305746 A221510 A109489 * A105401 A325595 A256031
KEYWORD
nonn,uned
AUTHOR
Roger L. Bagula, Apr 04 2010
STATUS
approved

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Last modified April 15 20:20 EDT 2024. Contains 371696 sequences. (Running on oeis4.)