|
Search: id:A108012
|
|
|
| A108012 |
|
a(n)= 8*a(n-1) -16*a(n-2) +4*a(n-4). |
|
+0
1
|
|
| 0, 4, 18, 76, 320, 1360, 5832, 25200, 109568, 478784, 2100512, 9244352, 40784896, 180284672, 798121088, 3537391360, 15692333056, 69661541376, 309407486464, 1374824795136, 6110847909888, 27168232722432, 120809925167104
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
FORMULA
|
G.f.: 2*x*(-2+7*x+2*x^2)/( (2*x^2+4*x-1) * (2*x^2-4*x+1)). [Sep 28 2009]
|
|
MATHEMATICA
|
M = {{0, 0, 0, 2}, {1, 4, 0, 0}, {0, 2, 0, 0}, {0, 0, 1, 4}} v[1] = {0, 1, 1, 2}; v[n_] := v[n] = M.v[n - 1]; digits = 50; a = Table[v[n][[1]], {n, 1, digits}]
|
|
CROSSREFS
|
Sequence in context: A066259 A084213 A048664 this_sequence A017958 A017959 A100069
Adjacent sequences: A108009 A108010 A108011 this_sequence A108013 A108014 A108015
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Roger L. Bagula (rlbagulatftn(AT)yahoo.com), May 30 2005
|
|
EXTENSIONS
|
Definition replaced by recurrence by the Associate Editors of the OEIS, Sep 28 2009
|
|
|
Search completed in 0.002 seconds
|
