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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 889 |
| 4 | 2359 |
| 5 | 299593 |
| 6 | 2033143 |
| 7 | 13549249 |
| 8 | 42931441 |
| 9 | 100170217 |
| 10 | 310935751 |
| 11 | 685169191 |
| 12 | 3606045247 |
| 13 | 4566096913 |
| 14 | 5452293007 |
| 15 | 6620620783 |
| 16 | 12721617559 |
| 17 | 30987132463 |
| 18 | 65576560063 |
| 19 | 92349997537 |
| 20 | 104785348087 |
| 21 | 457967746369 |
[1,7,889,2359,299593,2033143,13549249,42931441, 100170217,310935751,685169191,3606045247, 4566096913,5452293007,6620620783,12721617559, 30987132463,65576560063,92349997537,104785348087, 457967746369] |