|
|
A013741
|
|
a(n) = 7^(3*n + 2).
|
|
2
|
|
|
49, 16807, 5764801, 1977326743, 678223072849, 232630513987207, 79792266297612001, 27368747340080916343, 9387480337647754305649, 3219905755813179726837607, 1104427674243920646305299201, 378818692265664781682717625943
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
LINKS
|
|
|
FORMULA
|
a(n) = 343*a(n-1); a(0)=49.
G.f.: 49/(1-343*x). (End)
|
|
MAPLE
|
|
|
MATHEMATICA
|
7^(3Range[0, 20]+2) (* or *) NestList[343#&, 49, 20] (* Harvey P. Dale, Oct 03 2012 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|