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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 13 |
| 4 | 73 |
| 5 | 187 |
| 6 | 895 |
| 7 | 2737 |
| 8 | 11923 |
| 9 | 40333 |
| 10 | 166753 |
| 11 | 598111 |
| 12 | 2404309 |
| 13 | 8926651 |
| 14 | 35365651 |
| 15 | 134054005 |
| 16 | 527360581 |
| 17 | 2024611351 |
| 18 | 7940840719 |
| 19 | 30733601689 |
| 20 | 120439122811 |
| 21 | 468630460885 |
| 22 | 1836912780541 |
| 23 | 7173754477099 |
| 24 | 28140632060899 |
[1,1,7,13,73,187,895,2737,11923,40333,166753, 598111,2404309,8926651,35365651,134054005, 527360581,2024611351,7940840719,30733601689, 120439122811,468630460885,1836912780541, 7173754477099,28140632060899] |