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A169636 Number of permutations of A004001 sequence vectors:a(n)=Length[Permutations[Table[A004001[i], {i, 0, m}]]] 0

%I #2 Mar 30 2012 17:34:35

%S 1,2,3,12,30,180,1260,5040,15120,151200,1663200

%N Number of permutations of A004001 sequence vectors:a(n)=Length[Permutations[Table[A004001[i], {i, 0, m}]]]

%F f(n) = f(f(n - 1)) + f(n - f(n - 1));

%F a(n)=Length[Permutations[Table[f(i), {i, 0, m}]]]

%t (*A004001*)

%t f[0] = 0; f[1] = 1; f[2] = 1;

%t f[n_] := f[n] = f[f[n - 1]] + f[n - f[n - 1]];

%t a[m_] := Length[Permutations[Table[f[i], {i, 0, m}]]];

%t b = Table[a[m], {m, 0, 10}]

%K nonn,uned

%O 0,2

%A _Roger L. Bagula_, Apr 04 2010

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Last modified May 26 05:37 EDT 2024. Contains 372807 sequences. (Running on oeis4.)