n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 8 |
4 | 45 |
5 | 225 |
6 | 1005 |
7 | 4104 |
8 | 15592 |
9 | 55914 |
10 | 191522 |
11 | 632129 |
12 | 2024359 |
13 | 6323087 |
14 | 19343102 |
15 | 58140702 |
16 | 172156273 |
17 | 503228165 |
18 | 1454641954 |
19 | 4164043593 |
20 | 11818459242 |
21 | 33291210601 |
22 | 93152197045 |
23 | 259101275859 |
24 | 716858442400 |
25 | 1973889033615 |
[0,1,8,45,225,1005,4104,15592,55914,191522,632129, 2024359,6323087,19343102,58140702,172156273, 503228165,1454641954,4164043593,11818459242, 33291210601,93152197045,259101275859,716858442400, 1973889033615] |