n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 6 |
4 | 31 |
5 | 141 |
6 | 550 |
7 | 2046 |
8 | 8149 |
9 | 34902 |
10 | 152001 |
11 | 652150 |
12 | 2761689 |
13 | 11707811 |
14 | 50123854 |
15 | 216480177 |
16 | 938377955 |
17 | 4069585995 |
18 | 17658916102 |
19 | 76776575711 |
20 | 334729181549 |
21 | 1462999055814 |
22 | 6405806909581 |
23 | 28085236208039 |
24 | 123289001886325 |
[2,2,6,31,141,550,2046,8149,34902,152001,652150, 2761689,11707811,50123854,216480177,938377955, 4069585995,17658916102,76776575711,334729181549, 1462999055814,6405806909581,28085236208039, 123289001886325] |