The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A152270 Let f(n)=Floor[Mod[10^k*(7/(4*k + 1) - 6/(4*k + 3) - 1/(4*k + 5)), 3]]; M0 = {{0, 1}, {1, 1/2}}; M = {{0, 2}, {2, 1}}; as Mh=M0.M.(M0+I*f[n]); v[(n)=Mh.v(n-1), then a(n) is the first element of v. 1
 0, 1, -3, -13, 15, -37, 23, -125, -467, -2269, -2269, -12147, -66877, -66877, -66877, -66877, -370963, -2061725, -11464371, 17899313, 99555423, 99555423, -155471765, -864636987, 1350136841, 1350136841, -2108411107, -2108411107 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 MATHEMATICA f[k_] = Floor[Mod[10^k*(7/(4*k + 1) - 6/(4*k + 3) - 1/(4*k + 5)), 3]]; M0 = {{0, 1}, {1, 1/2}}; M = {{0, 2}, {2, 1}}; Mh[n_] := M0.(M.Inverse[f[n]*IdentityMatrix[2] + M0]); v[0] = {0, 1}; v[n_] := v[n] = Mh[n].v[n - 1] Table[ -v[n][[1]]/2, {n, 0, 30}] CROSSREFS Sequence in context: A146512 A082704 A353060 * A032919 A340018 A216044 Adjacent sequences: A152267 A152268 A152269 * A152271 A152272 A152273 KEYWORD sign,uned,obsc,base AUTHOR Roger L. Bagula and Alexander R. Povolotsky, Dec 01 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 26 19:26 EDT 2023. Contains 365666 sequences. (Running on oeis4.)