|
|
A166867
|
|
a(n) = Pell(n+3) - Jacobsthal(n+4).
|
|
1
|
|
|
0, 1, 8, 27, 84, 237, 644, 1695, 4376, 11129, 28000, 69859, 173180, 427141, 1049308, 2569447, 6275584, 15295377, 37215864, 90426155, 219466276, 532154909, 1289368500, 3122076719, 7555891560, 18278599081, 44202568208, 106862692467
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,3
|
|
LINKS
|
|
|
FORMULA
|
G.f.: x(1+5x+2x^2)/((1-x-2x^2)(1-2x-x^2)).
a(n) = 3*a(n-1) + a(n-2) - 5*a(n-3) - 2*a(n-4). - G. C. Greubel, May 25 2016
|
|
MATHEMATICA
|
LinearRecurrence[{3, 1, -5, -2}, {0, 1, 8, 27}, 50] (* G. C. Greubel, May 25 2016 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|