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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 31 |
| 4 | 241 |
| 5 | 2261 |
| 6 | 25501 |
| 7 | 319915 |
| 8 | 4564001 |
| 9 | 71905321 |
| 10 | 1240694101 |
| 11 | 23250921431 |
| 12 | 470598127825 |
| 13 | 10200501671101 |
| 14 | 236040247113581 |
| 15 | 5800885227542371 |
| 16 | 150850086300786241 |
| 17 | 4137020164029442385 |
| 18 | 119309846230265324581 |
| 19 | 3608164806033723494671 |
[1,1,5,31,241,2261,25501,319915,4564001,71905321, 1240694101,23250921431,470598127825, 10200501671101,236040247113581,5800885227542371, 150850086300786241,4137020164029442385, 119309846230265324581,3608164806033723494671] |