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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 41 |
| 3 | 241 |
| 4 | 1417 |
| 5 | 8333 |
| 6 | 49005 |
| 7 | 288193 |
| 8 | 1694833 |
| 9 | 9967141 |
| 10 | 58615749 |
| 11 | 344713305 |
| 12 | 2027224169 |
| 13 | 11921900829 |
| 14 | 70111496093 |
| 15 | 412318635697 |
| 16 | 2424804301985 |
| 17 | 14260029486677 |
| 18 | 83861794865077 |
| 19 | 493182755657289 |
| 20 | 2900358033942041 |
| 21 | 17056713010658765 |
| 22 | 100308808541321741 |
[1,7,41,241,1417,8333,49005,288193,1694833, 9967141,58615749,344713305,2027224169,11921900829, 70111496093,412318635697,2424804301985, 14260029486677,83861794865077,493182755657289, 2900358033942041,17056713010658765, 100308808541321741] |