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A028892
a(n) = Fibonacci(n) - 2^(floor(n/2)).
1
-1, 0, -1, 0, -1, 1, 0, 5, 5, 18, 23, 57, 80, 169, 249, 482, 731, 1341, 2072, 3669, 5741, 9922, 15663, 26609, 42272, 70929, 113201, 188226, 301427, 497845, 799272, 1313501, 2112773, 3459042, 5571815, 9096393
OFFSET
0,8
LINKS
FORMULA
Empirical G.f.: -(x^3-2*x^2-x+1)/((x^2+x-1)*(2*x^2-1)). - Colin Barker, Sep 21 2012
a(n) = A000045(n) - A016116(n). - Michel Marcus, Aug 20 2017
MATHEMATICA
Table[Fibonacci[n] - 2^(Floor[n/2]), {n, 0, 50}] (* G. C. Greubel, Aug 19 2017 *)
PROG
(PARI) for(n=0, 50, print1(fibonacci(n) - 2^(floor(n/2)), ", ")) \\ G. C. Greubel, Aug 19 2017
CROSSREFS
Sequence in context: A283089 A283142 A303310 * A255448 A255445 A255454
KEYWORD
sign
STATUS
approved