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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 103 |
| 4 | 829 |
| 5 | 7261 |
| 6 | 66595 |
| 7 | 598627 |
| 8 | 5377849 |
| 9 | 48426745 |
| 10 | 435876607 |
| 11 | 3922582687 |
| 12 | 35303534581 |
| 13 | 317733991381 |
| 14 | 2859598948507 |
| 15 | 25736384863003 |
| 16 | 231627537879409 |
| 17 | 2084647743751921 |
| 18 | 18761829221081335 |
| 19 | 168856464809568727 |
| 20 | 1519708183900618669 |
| 21 | 13677373637498037325 |
[1,1,7,103,829,7261,66595,598627,5377849,48426745, 435876607,3922582687,35303534581,317733991381, 2859598948507,25736384863003,231627537879409, 2084647743751921,18761829221081335, 168856464809568727,1519708183900618669, 13677373637498037325] |