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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 9 |
| 4 | 30 |
| 5 | 33 |
| 6 | 203 |
| 7 | 220 |
| 8 | 1368 |
| 9 | 2638 |
| 10 | 10561 |
| 11 | 10726 |
| 12 | 18926 |
| 13 | 86693 |
| 14 | 101294 |
| 15 | 170447 |
| 16 | 734638 |
| 17 | 749502 |
| 18 | 1503095 |
| 19 | 3131428 |
| 20 | 6504583 |
| 21 | 27508889 |
| 22 | 56295291 |
| 23 | 66084700 |
| 24 | 98097954 |
[1,6,9,30,33,203,220,1368,2638,10561,10726,18926, 86693,101294,170447,734638,749502,1503095,3131428, 6504583,27508889,56295291,66084700,98097954] |