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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 26 |
| 7 | 459 |
| 8 | 7037 |
| 9 | 102075 |
| 10 | 1457407 |
| 11 | 20922336 |
| 12 | 305907060 |
| 13 | 4594540541 |
| 14 | 71326622649 |
| 15 | 1149849718045 |
[1,26,459,7037,102075,1457407,20922336,305907060, 4594540541,71326622649,1149849718045] |