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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 33 |
| 4 | 328 |
| 5 | 3245 |
| 6 | 52056 |
| 7 | 828583 |
| 8 | 17328256 |
| 9 | 389416329 |
| 10 | 10105386400 |
| 11 | 285351587411 |
| 12 | 8955841614336 |
| 13 | 302881333613053 |
| 14 | 11126513414294656 |
| 15 | 437935136609883375 |
| 16 | 18455736024587862016 |
| 17 | 827240617573764860177 |
| 18 | 39353706314004951028224 |
[1,6,33,328,3245,52056,828583,17328256,389416329, 10105386400,285351587411,8955841614336, 302881333613053,11126513414294656, 437935136609883375,18455736024587862016, 827240617573764860177,39353706314004951028224] |