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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 1 |
| 5 | 43 |
| 6 | 79 |
| 7 | 717 |
| 8 | 3481 |
| 9 | 100189 |
| 10 | 533077 |
| 11 | 1777722593 |
| 12 | 156155179 |
| 13 | 74216302403 |
| 14 | 15537618841 |
| 15 | 11069240202341 |
| 16 | 5762870563187 |
| 17 | 2682308717818019 |
| 18 | 927089189292457 |
| 19 | 3726882116303677517 |
| 20 | 35762248102620751 |
| 21 | 1529769611935770520751 |
| 22 | 1576432862602739502061 |
[3,1,1,7,1,43,79,717,3481,100189,533077, 1777722593,156155179,74216302403,15537618841, 11069240202341,5762870563187,2682308717818019, 927089189292457,3726882116303677517, 35762248102620751,1529769611935770520751, 1576432862602739502061] |