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A202626 Order of Fibonacci group F(n,4) (or 0 if the group is infinite). 1
0, 5, 0, 3, 624, 125, 0, 7, 6560, 4905, 0, 11, 28560, 104845, 0, 15, 83520, 2236945, 0, 19, 194480, 43997205, 0, 23, 390624, 839065625, 0, 27, 707280, 15568306205, 0, 31, 1185920, 283472166945, 0, 35, 1874160, 5085221879845, 0, 39, 2825760, 90160039460905, 0, 43, 4100624, 1583296366510125, 0, 47, 5764800, 27584549361811505, 0, 51, 7890480 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..53.

MAPLE

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

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;

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

CROSSREFS

Cf. A202624. A202628 is a subsequence.

Sequence in context: A300728 A321418 A225424 * A011995 A258754 A175296

Adjacent sequences: A202623 A202624 A202625 * A202627 A202628 A202629

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 30 2011

STATUS

approved

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Last modified November 29 18:13 EST 2022. Contains 358431 sequences. (Running on oeis4.)