|
|
A013723
|
|
a(n) = 18^(2*n + 1).
|
|
3
|
|
|
18, 5832, 1889568, 612220032, 198359290368, 64268410079232, 20822964865671168, 6746640616477458432, 2185911559738696531968, 708235345355337676357632, 229468251895129407139872768
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
LINKS
|
|
|
FORMULA
|
a(n) = 324*a(n-1); a(0)=18.
G.f.: 18/(1-324*x). (End)
|
|
MAPLE
|
|
|
MATHEMATICA
|
18^(2*Range[0, 20]+1) (* or *) NestList[324#&, 18, 20] (* Harvey P. Dale, Sep 28 2021 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|