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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 36 |
| 3 | 163 |
| 4 | 738 |
| 5 | 3516 |
| 6 | 17919 |
| 7 | 97849 |
| 8 | 570383 |
| 9 | 3532239 |
| 10 | 23132758 |
| 11 | 159573602 |
| 12 | 1155434411 |
| 13 | 8755269880 |
| 14 | 69244208899 |
| 15 | 570254905607 |
| 16 | 4879985079384 |
| 17 | 43312872677674 |
| 18 | 398041803812734 |
| 19 | 3781687068799550 |
| 20 | 37091840207913759 |
[7,36,163,738,3516,17919,97849,570383,3532239, 23132758,159573602,1155434411,8755269880, 69244208899,570254905607,4879985079384, 43312872677674,398041803812734,3781687068799550, 37091840207913759] |