n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 23 |
5 | 111 |
6 | 642 |
7 | 4326 |
8 | 33333 |
9 | 288901 |
10 | 2782082 |
11 | 29471046 |
12 | 340568843 |
13 | 4263603891 |
14 | 57482264322 |
15 | 830335952166 |
16 | 12793889924553 |
17 | 209449977967081 |
18 | 3630626729775362 |
19 | 66429958806679686 |
20 | 1279448352687538463 |
21 | 25874432578888440471 |
22 | 548178875969847203202 |
[1,1,2,6,23,111,642,4326,33333,288901,2782082, 29471046,340568843,4263603891,57482264322, 830335952166,12793889924553,209449977967081, 3630626729775362,66429958806679686, 1279448352687538463,25874432578888440471, 548178875969847203202] |