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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 3 |
| 5 | 19 |
| 6 | 119 |
| 7 | 839 |
| 8 | 6719 |
| 9 | 60479 |
| 10 | 604799 |
| 11 | 6652799 |
| 12 | 79833599 |
| 13 | 1037836799 |
| 14 | 14529715199 |
| 15 | 217945727999 |
| 16 | 3487131647999 |
| 17 | 59281238015999 |
| 18 | 1067062284287999 |
| 19 | 20274183401471999 |
| 20 | 405483668029439999 |
[0,3,19,119,839,6719,60479,604799,6652799, 79833599,1037836799,14529715199,217945727999, 3487131647999,59281238015999,1067062284287999, 20274183401471999,405483668029439999] |