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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 8 |
| 9 | 64 |
| 10 | 394 |
| 11 | 2390 |
| 12 | 13297 |
| 13 | 73408 |
| 14 | 391136 |
| 15 | 2079440 |
| 16 | 10889818 |
| 17 | 57092581 |
| 18 | 297655901 |
| 19 | 1556501986 |
| 20 | 8132631687 |
| 21 | 42662224461 |
| 22 | 224171916523 |
| 23 | 1183189769473 |
| 24 | 6263511343367 |
| 25 | 33311244068612 |
| 26 | 177803544643092 |
| 27 | 953453596829798 |
| 28 | 5132942333604244 |
| 29 | 27758886429083153 |
[1,8,64,394,2390,13297,73408,391136,2079440, 10889818,57092581,297655901,1556501986,8132631687, 42662224461,224171916523,1183189769473, 6263511343367,33311244068612,177803544643092, 953453596829798,5132942333604244, 27758886429083153] |