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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 7 |
| 9 | 522 |
| 10 | 4260 |
| 11 | 163871 |
| 12 | 1572713 |
| 13 | 49601660 |
| 14 | 554432537 |
| 15 | 16431601190 |
| 16 | 211104220038 |
| 17 | 6214132488281 |
| 18 | 90601727479330 |
| 19 | 2718687446733807 |
| 20 | 44477388811619142 |
| 21 | 1378374571651666083 |
| 22 | 25055072909382001747 |
| 23 | 807272266530396465622 |
| 24 | 16165637154045080226474 |
[1,7,522,4260,163871,1572713,49601660,554432537, 16431601190,211104220038,6214132488281, 90601727479330,2718687446733807,44477388811619142, 1378374571651666083,25055072909382001747, 807272266530396465622,16165637154045080226474] |