|
|
A026046
|
|
a(n) = dot_product(1,2,...,n)*(6,7,...,n,1,2,3,4,5).
|
|
4
|
|
|
76, 105, 144, 195, 260, 341, 440, 559, 700, 865, 1056, 1275, 1524, 1805, 2120, 2471, 2860, 3289, 3760, 4275, 4836, 5445, 6104, 6815, 7580, 8401, 9280, 10219, 11220, 12285, 13416, 14615, 15884, 17225, 18640, 20131, 21700, 23349, 25080, 26895, 28796, 30785, 32864, 35035, 37300
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
6,1
|
|
LINKS
|
|
|
FORMULA
|
G.f.: x^6*(76-199*x+180*x^2-55*x^3)/(1-x)^4. - Colin Barker, Sep 17 2012
|
|
MATHEMATICA
|
CoefficientList[Series[(76 - 199 x + 180 x^2 - 55 x^3)/(1 - x)^4, {x, 0, 60}], x] (* Vincenzo Librandi, Oct 17 2013 *)
Table[Range[n].Join[Range[6, n], Range[5]], {n, 6, 50}] (* or *) LinearRecurrence[{4, -6, 4, -1}, {76, 105, 144, 195}, 50] (* Harvey P. Dale, Mar 12 2023 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|