n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 20 |
5 | 158 |
6 | 1539 |
7 | 16970 |
8 | 199879 |
9 | 2460350 |
10 | 31266165 |
11 | 407461893 |
12 | 5420228329 |
13 | 73352481577 |
14 | 1007312969202 |
15 | 14008437540003 |
16 | 196963172193733 |
17 | 2796235114720116 |
18 | 40038505601111596 |
19 | 577693117173844307 |
20 | 8392528734991449808 |
21 | 122680472402091278920 |
22 | 1803416089912665770579 |
[1,1,1,4,20,158,1539,16970,199879,2460350, 31266165,407461893,5420228329,73352481577, 1007312969202,14008437540003,196963172193733, 2796235114720116,40038505601111596, 577693117173844307,8392528734991449808, 122680472402091278920,1803416089912665770579] |