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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 264 |
| 5 | 18192 |
| 6 | 3363168 |
| 7 | 1536410944 |
| 8 | 1659081681024 |
| 9 | 4119831378999040 |
| 10 | 23085227981131301376 |
| 11 | 287864665471943041639424 |
| 12 | 7902500071635377252245854208 |
| 13 | 473485024165978066993819500335104 |
| 14 | 61476984240894226792319001395455369216 |
[1,2,12,264,18192,3363168,1536410944, 1659081681024,4119831378999040, 23085227981131301376,287864665471943041639424, 7902500071635377252245854208, 473485024165978066993819500335104, 61476984240894226792319001395455369216] |