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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 Table of n, a(n) for n=0..10. FORMULA f(n) = f(f(n - 1)) + f(n - f(n - 1)); a(n)=Length[Permutations[Table[f(i), {i, 0, m}]]] MATHEMATICA (*A004001*) 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 Adjacent sequences: A169633 A169634 A169635 * A169637 A169638 A169639 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.)