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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 22 |
| 6 | 164 |
| 7 | 1599 |
| 8 | 19624 |
| 9 | 292799 |
| 10 | 5162063 |
| 11 | 105139954 |
| 12 | 2430528374 |
| 13 | 62877375426 |
| 14 | 1799698534522 |
| 15 | 56461862815496 |
| 16 | 1926534563625822 |
| 17 | 71024188655886038 |
| 18 | 2813193432059656268 |
| 19 | 119136308527407025379 |
| 20 | 5371507426340905440926 |
[1,4,22,164,1599,19624,292799,5162063,105139954, 2430528374,62877375426,1799698534522, 56461862815496,1926534563625822,71024188655886038, 2813193432059656268,119136308527407025379, 5371507426340905440926] |