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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 120 |
| 5 | 948 |
| 6 | 8022 |
| 7 | 71106 |
| 8 | 651717 |
| 9 | 6126175 |
| 10 | 58736535 |
| 11 | 572178165 |
| 12 | 5647102500 |
| 13 | 56345894052 |
| 14 | 567444190680 |
| 15 | 5760259701864 |
| 16 | 58879552102416 |
| 17 | 605508278430348 |
| 18 | 6260413541738610 |
| 19 | 65036607553643550 |
| 20 | 678530086525374930 |
| 21 | 7106457298203380370 |
| 22 | 74688269331406258260 |
| 23 | 787463653336202248380 |
[1,3,17,120,948,8022,71106,651717,6126175, 58736535,572178165,5647102500,56345894052, 567444190680,5760259701864,58879552102416, 605508278430348,6260413541738610, 65036607553643550,678530086525374930, 7106457298203380370,74688269331406258260, 787463653336202248380] |