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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 7 |
| 2 | 17 |
| 3 | 70 |
| 4 | 111 |
| 5 | 258 |
| 6 | 689 |
| 7 | 454 |
| 8 | 7133 |
| 9 | 15977 |
| 10 | 82869 |
| 11 | 111044 |
| 12 | 536687 |
| 13 | 384769 |
| 14 | 2750561 |
| 15 | 7063105 |
[0,7,17,70,111,258,689,454,7133,15977,82869, 111044,536687,384769,2750561,7063105] |