|
|
A074561
|
|
a(n) = 4^n + 5^n + 6^n.
|
|
1
|
|
|
3, 15, 77, 405, 2177, 11925, 66377, 374445, 2135777, 12292965, 71280377, 415819485, 2437700177, 14348506005, 84736115177, 501776304525, 2977992765377, 17706778767045, 105443373410777, 628708104245565
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
LINKS
|
|
|
FORMULA
|
G.f.: 1/(1-4*x) + 1/(1-5*x) + 1/(1-6*x).
E.g.f.: exp(4*x) + exp(5*x) + exp(6*x). (End)
|
|
MATHEMATICA
|
Table[4^n + 5^n + 6^n, {n, 0, 19}]
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|