|
| |
|
|
A165147
|
|
a(n) = (3*7^n-3^n)/2.
|
|
2
|
|
|
|
1, 9, 69, 501, 3561, 25089, 176109, 1234221, 8643921, 60520569, 423683349, 2965901541, 20761665081, 145332718449, 1017332217789, 7121335090461, 49849374331041, 348945706410729, 2442620203155429, 17098342196928981
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
| |
| |
|
|
