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A202626 Order of Fibonacci group F(n,4) (or 0 if the group is infinite). 1

%I #7 Mar 30 2012 16:52:08

%S 0,5,0,3,624,125,0,7,6560,4905,0,11,28560,104845,0,15,83520,2236945,0,

%T 19,194480,43997205,0,23,390624,839065625,0,27,707280,15568306205,0,

%U 31,1185920,283472166945,0,35,1874160,5085221879845,0,39,2825760,90160039460905,0,43,4100624,1583296366510125,0,47,5764800,27584549361811505,0,51,7890480

%N Order of Fibonacci group F(n,4) (or 0 if the group is infinite).

%C A column of the array described in A202624. See that entry for references.

%p g:=k->(4*k+1)*(2^(4*k+1)+(-1)^k*2^(2*k+1)+1);

%p f:=n-> if n mod 4 = 0 then n-1 elif n mod 4 = 1 then n^4-1 elif n mod 4 = 2 then g((n-2)/4); else 0; fi;

%p [seq(f(n),n=1..60)];

%Y Cf. A202624. A202628 is a subsequence.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Dec 30 2011

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Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)