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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 70 |
| 4 | 851 |
| 5 | 15246 |
| 6 | 384147 |
| 7 | 13065354 |
| 8 | 578905875 |
| 9 | 32440563766 |
| 10 | 2243907466283 |
| 11 | 187796863841346 |
| 12 | 18704441632101337 |
| 13 | 2186374265471576090 |
| 14 | 296396762529435076953 |
| 15 | 46126320892158605384334 |
| 16 | 8167358455139620845210003 |
| 17 | 1632571811017090501346518086 |
[1,2,9,70,851,15246,384147,13065354,578905875, 32440563766,2243907466283,187796863841346, 18704441632101337,2186374265471576090, 296396762529435076953,46126320892158605384334, 8167358455139620845210003, 1632571811017090501346518086] |