|
|
A054121
|
|
T(n,n-3), array T as in A054120.
|
|
0
|
|
|
1, 9, 39, 114, 261, 507, 879, 1404, 2109, 3021, 4167, 5574, 7269, 9279, 11631, 14352, 17469, 21009, 24999, 29466, 34437, 39939, 45999, 52644, 59901, 67797, 76359, 85614, 95589, 106311, 117807, 130104, 143229, 157209
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
3,2
|
|
LINKS
|
|
|
FORMULA
|
For n>3, a(n) = 3/2 * (3n^3-30n^2+107n-134).
|
|
MATHEMATICA
|
LinearRecurrence[{4, -6, 4, -1}, {1, 9, 39, 114, 261}, 40] (* Harvey P. Dale, Sep 28 2017 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|