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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 13 |
| 5 | 22 |
| 6 | 79 |
| 7 | 108 |
| 8 | 593 |
| 9 | 722 |
| 10 | 5471 |
| 11 | 6290 |
| 12 | 62653 |
| 13 | 69558 |
| 14 | 876329 |
| 15 | 951338 |
| 16 | 14679751 |
| 17 | 15692307 |
| 18 | 289078661 |
| 19 | 305618710 |
| 20 | 6588286337 |
| 21 | 6908033000 |
| 22 | 171482959009 |
| 23 | 178668550322 |
| 24 | 5040266614919 |
| 25 | 5225256019175 |
| 26 | 165678678591359 |
| 27 | 171068472492228 |
| 28 | 6039923990345039 |
[1,2,6,13,22,79,108,593,722,5471,6290,62653,69558, 876329,951338,14679751,15692307,289078661, 305618710,6588286337,6908033000,171482959009, 178668550322,5040266614919,5225256019175, 165678678591359,171068472492228,6039923990345039] |