|
|
A022280
|
|
a(n) = n*(23*n - 1)/2.
|
|
2
|
|
|
0, 11, 45, 102, 182, 285, 411, 560, 732, 927, 1145, 1386, 1650, 1937, 2247, 2580, 2936, 3315, 3717, 4142, 4590, 5061, 5555, 6072, 6612, 7175, 7761, 8370, 9002, 9657, 10335, 11036, 11760, 12507, 13277
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
G.f.: x*(11 + 12*x)/(1 - x)^3.
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3). (End)
|
|
MATHEMATICA
|
|
|
PROG
|
|
|
CROSSREFS
|
Cf. similar sequences listed in A022288.
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|