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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 891 |
| 9 | 18043 |
| 10 | 337210 |
| 11 | 6081686 |
| 12 | 108469917 |
| 13 | 1941309261 |
| 14 | 35187952132 |
| 15 | 649951312000 |
| 16 | 12286366975723 |
| 17 | 238445927000811 |
| 18 | 4762398793018878 |
| 19 | 98074791689121162 |
| 20 | 2085684931155975120 |
| 21 | 45859509146309390064 |
| 22 | 1043533983233372354613 |
| 23 | 24590543663448304800169 |
[1,37,891,18043,337210,6081686,108469917, 1941309261,35187952132,649951312000, 12286366975723,238445927000811,4762398793018878, 98074791689121162,2085684931155975120, 45859509146309390064,1043533983233372354613, 24590543663448304800169] |