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| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 640 |
| 10 | 152911 |
| 11 | 23164846 |
| 12 | 2714820329 |
| 13 | 271759470360 |
| 14 | 24588746199473 |
| 15 | 2082837287313124 |
| 16 | 169027530016448143 |
| 17 | 13349998611515172343 |
| 18 | 1037605365413191022180 |
| 19 | 79994419884937925588421 |
| 20 | 6152869874227250487574264 |
| 21 | 474174252765810600785056187 |
[1,640,152911,23164846,2714820329,271759470360, 24588746199473,2082837287313124, 169027530016448143,13349998611515172343, 1037605365413191022180,79994419884937925588421, 6152869874227250487574264, 474174252765810600785056187] |