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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 76 |
| 4 | 600 |
| 5 | 5304 |
| 6 | 50232 |
| 7 | 498360 |
| 8 | 5112756 |
| 9 | 53796820 |
| 10 | 577370508 |
| 11 | 6295961100 |
| 12 | 69557631936 |
| 13 | 776913430272 |
| 14 | 8758443555360 |
| 15 | 99527014659360 |
| 16 | 1138832618425272 |
| 17 | 13110313153525272 |
| 18 | 151738042878341400 |
| 19 | 1764609260161776600 |
[1,3,12,76,600,5304,50232,498360,5112756,53796820, 577370508,6295961100,69557631936,776913430272, 8758443555360,99527014659360,1138832618425272, 13110313153525272,151738042878341400, 1764609260161776600] |