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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 7 |
| 5 | 11 |
| 6 | 281 |
| 7 | 449 |
| 8 | 20719 |
| 9 | 75403 |
| 10 | 3066769 |
| 11 | 1234967 |
| 12 | 821856311 |
| 13 | 2223747371 |
| 14 | 273942958057 |
| 15 | 1238828105761 |
| 16 | 12489209350781 |
| 17 | 511763293389419 |
| 18 | 13479473195610647 |
| 19 | 356089289643109313 |
| 20 | 78908612931754624999 |
| 21 | 373825489242185563339 |
| 22 | 83933730864756536571961 |
[1,0,1,1,7,11,281,449,20719,75403,3066769,1234967, 821856311,2223747371,273942958057,1238828105761, 12489209350781,511763293389419,13479473195610647, 356089289643109313,78908612931754624999, 373825489242185563339,83933730864756536571961] |