This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A107467 a(n)= 3*a(n-1) +a(n-2) -3*a(n-3) +a(n-4) 2*a(n-5) -a(n-6) -a(n-7). 0
 0, 1, 1, 2, 3, 5, 8, 23, 67, 208, 635, 1943, 5940, 18169, 55579, 170024, 520127, 1591139, 4867506, 14890349, 45551563, 139348310, 426285079, 1304062953, 3989302624, 12203809169, 37333081059, 114206877712, 349374081829 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS FORMULA G.f.: x*(1-2*x-2*x^2-x^3-4*x^4-7*x^5)/(1-3*x-x^2+3*x^3-x^4-2*x^5+x^6+x^7). [Sep 28 2009] MATHEMATICA M = {{0, 1, 0, 0, 0, 0, 0}, {0, 0, 1, 0, 0, 0, 0}, {0, 0, 0, 1, 0, 0, 0}, {0, 0, 0, 0, 1, 0, 0}, {0, 0, 0, 0, 0, 1, 0}, {0, 0, 0, 0, 0, 0, 1}, {-1, -1, 2, 1, -3, 1, 3}} v[n_] := v[n] = M.v[n - 1] a = Table[v[n][[1]], {n, 1, digits}] CROSSREFS Sequence in context: A178356 A042785 A136682 * A191425 A155881 A041731 Adjacent sequences:  A107464 A107465 A107466 * A107468 A107469 A107470 KEYWORD nonn,easy AUTHOR Roger L. Bagula, May 27 2005 EXTENSIONS Definition replaced by recurrence by the Associate Editors of the OEIS, Sep 28 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .