OFFSET
0,1
COMMENTS
A subsequence of one of the columns of the array described in A202624.
LINKS
David J. Seal, The orders of the Fibonacci groups, Proc. Roy. Soc. Edinburgh, Sect. A 92 (1982), no. 3-4, 181-192.
Index entries for linear recurrences with constant coefficients, signature (26,-65,-1480,-1040,6656,-4096).
FORMULA
a(0)=5, a(1)=125, a(2)=4905, a(3)=104845, a(4)=2236945, a(5)=43997205, a(n)=26*a(n-1)-65*a(n-2)-1480*a(n-3)-1040*a(n-4)+ 6656*a(n-5)- 4096*a(n-6). - Harvey P. Dale, May 23 2014
G.f.: 5*(1-x+396*x^2-1432*x^3+4000*x^4+1536*x^5)/(x-1)^2/(4*x+1)^2/(16*x-1)^2 . - R. J. Mathar, Sep 02 2017
MATHEMATICA
Table[(4n+1)(2^(4n+1)+(-1)^n 2^(2n+1)+1), {n, 0, 20}] (* or *) LinearRecurrence[ {26, -65, -1480, -1040, 6656, -4096}, {5, 125, 4905, 104845, 2236945, 43997205}, 20] (* Harvey P. Dale, May 23 2014 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Dec 31 2011
STATUS
approved