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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 309 |
| 4 | 6244 |
| 5 | 119390 |
| 6 | 2131096 |
| 7 | 36258678 |
| 8 | 594236950 |
| 9 | 9502175342 |
| 10 | 149094022594 |
| 11 | 2303609997650 |
| 12 | 35156424933146 |
| 13 | 531063422607186 |
| 14 | 7952651367000598 |
| 15 | 118206136820451322 |
| 16 | 1745636429854447262 |
| 17 | 25632755261397583238 |
[0,6,309,6244,119390,2131096,36258678,594236950, 9502175342,149094022594,2303609997650, 35156424933146,531063422607186,7952651367000598, 118206136820451322,1745636429854447262, 25632755261397583238] |