|
|
A168463
|
|
a(n) = 5 + 11*floor(n/2).
|
|
1
|
|
|
5, 16, 16, 27, 27, 38, 38, 49, 49, 60, 60, 71, 71, 82, 82, 93, 93, 104, 104, 115, 115, 126, 126, 137, 137, 148, 148, 159, 159, 170, 170, 181, 181, 192, 192, 203, 203, 214, 214, 225, 225, 236, 236, 247, 247, 258, 258, 269, 269, 280, 280, 291, 291, 302, 302, 313
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
FORMULA
|
a(n) = 11*n - a(n-1) - 1, with n>1, a(1)=5.
a(n) = (22*n + 11*(-1)^n + 9)/4.
E.g.f.: (1/4)*(11 - 20*exp(x) + (22*x + 9)*exp(2*x))*exp(-x). (End)
|
|
MATHEMATICA
|
Table[5 + 11 Floor[n/2], {n, 70}] (* or *) CoefficientList[Series[(5 + 11 x - 5 x^2)/((1 + x) (x - 1)^2), {x, 0, 70}], x] (* Vincenzo Librandi, Sep 19 2013 *)
LinearRecurrence[{1, 1, -1}, {5, 16, 16}, 80] (* Harvey P. Dale, Aug 28 2019 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|