|
|
A169832
|
|
a(n) = 15*2^(n+1) - (5*n^2+22*n+30).
|
|
1
|
|
|
0, 3, 26, 99, 282, 695, 1578, 3411, 7154, 14727, 29970, 60563, 121866, 244599, 490202, 981555, 1964418, 3930311, 7862274, 15726387, 31454810, 62911863, 125826186, 251655059, 503313042, 1006629255, 2013261938, 4026527571, 8053059114, 16106122487, 32212249530
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
G.f.: x*(3+11*x-4*x^2)/[(1-2*x)*(1-x)^3].
a(n) - 5*a(n-1) + 9*a(n-2) - 7*a(n-3) + 2*a(n-4) = 0, with n>3. (End)
|
|
MATHEMATICA
|
LinearRecurrence[{5, -9, 7, -2}, {0, 3, 26, 99}, 40] (* Harvey P. Dale, Sep 24 2014 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|