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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 32 |
| 3 | 230 |
| 4 | 1724 |
| 5 | 13100 |
| 6 | 99968 |
| 7 | 763880 |
| 8 | 5839376 |
| 9 | 44643920 |
| 10 | 341330432 |
| 11 | 2609713760 |
| 12 | 19953189824 |
| 13 | 152557050560 |
| 14 | 1166413088768 |
| 15 | 8918103977600 |
| 16 | 68185604178176 |
| 17 | 521330170184960 |
| 18 | 3985960826642432 |
| 19 | 30475665203095040 |
[1,5,32,230,1724,13100,99968,763880,5839376, 44643920,341330432,2609713760,19953189824, 152557050560,1166413088768,8918103977600, 68185604178176,521330170184960,3985960826642432, 30475665203095040] |