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| n | a(n) |
|---|---|
| 1 | 135 |
| 2 | 297 |
| 3 | 792 |
| 4 | 1575 |
| 5 | 10143 |
| 6 | 31185 |
| 7 | 63261 |
| 8 | 329931 |
| 9 | 15796476 |
| 10 | 44108109 |
| 11 | 4835271870 |
| 12 | 7346629512 |
| 13 | 12292341831 |
| 14 | 18440293320 |
| 15 | 107438159466 |
| 16 | 129913904637 |
| 17 | 156919475295 |
| 18 | 250438925115 |
| 19 | 1527273599625 |
| 20 | 3345365983698 |
| 21 | 3646072432125 |
| 22 | 7206841706490 |
[135,297,792,1575,10143,31185,63261,329931, 15796476,44108109,4835271870,7346629512, 12292341831,18440293320,107438159466,129913904637, 156919475295,250438925115,1527273599625, 3345365983698,3646072432125,7206841706490] |