n | a(n) |
---|---|
1 | 7 |
2 | 21 |
3 | 104 |
4 | 531 |
5 | 2708 |
6 | 13725 |
7 | 69784 |
8 | 354500 |
9 | 1800573 |
10 | 9147029 |
11 | 46470551 |
12 | 236075721 |
13 | 1199269936 |
14 | 6092401321 |
15 | 30950120371 |
16 | 157229758186 |
17 | 798741995975 |
18 | 4057687878111 |
19 | 20613461578083 |
20 | 104718433050887 |
21 | 531979987846229 |
[7,21,104,531,2708,13725,69784,354500,1800573, 9147029,46470551,236075721,1199269936,6092401321, 30950120371,157229758186,798741995975, 4057687878111,20613461578083,104718433050887, 531979987846229] |