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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 12 |
| 3 | 207 |
| 4 | 9184 |
| 5 | 173225 |
| 6 | 46097856 |
| 7 | 729481375 |
| 8 | 454190410752 |
| 9 | 30607186160529 |
| 10 | 12762075858688000 |
| 11 | 1036636706945881151 |
| 12 | 3080713389889966460928 |
| 13 | 145084860487902521548921 |
| 14 | 124325137916420574135066624 |
| 15 | 56537825009822523196823829375 |
[1,1,12,207,9184,173225,46097856,729481375, 454190410752,30607186160529,12762075858688000, 1036636706945881151,3080713389889966460928, 145084860487902521548921, 124325137916420574135066624, 56537825009822523196823829375] |