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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 31 |
| 3 | 1684 |
| 4 | 271776 |
| 5 | 97484904 |
| 6 | 65617109160 |
| 7 | 74248657560720 |
| 8 | 130752443907524880 |
| 9 | 338450307621257099520 |
| 10 | 1232284889962378714855680 |
| 11 | 6094200542431309662145478400 |
| 12 | 39788645361978802435089535468800 |
| 13 | 334957784448996146804912925763507200 |
[1,3,31,1684,271776,97484904,65617109160, 74248657560720,130752443907524880, 338450307621257099520,1232284889962378714855680, 6094200542431309662145478400, 39788645361978802435089535468800, 334957784448996146804912925763507200] |