n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 9 |
4 | 22 |
5 | 115 |
6 | 576 |
7 | 2569 |
8 | 16780 |
9 | 100041 |
10 | 660220 |
11 | 4683811 |
12 | 36128544 |
13 | 279022627 |
14 | 2268178290 |
15 | 20870481675 |
16 | 183829795216 |
17 | 1733470364065 |
18 | 17049910933404 |
19 | 176955696148171 |
20 | 1863799931450200 |
21 | 19988658792216891 |
22 | 227401089360840802 |
23 | 2637188651044286923 |
[1,1,2,9,22,115,576,2569,16780,100041,660220, 4683811,36128544,279022627,2268178290,20870481675, 183829795216,1733470364065,17049910933404, 176955696148171,1863799931450200, 19988658792216891,227401089360840802, 2637188651044286923] |