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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 12 |
| 4 | 10 |
| 5 | 50 |
| 6 | 306 |
| 7 | 1788 |
| 8 | 9420 |
| 9 | 54166 |
| 10 | 320796 |
| 11 | 1915104 |
| 12 | 11251252 |
| 13 | 65388276 |
| 14 | 380648010 |
| 15 | 2245338222 |
| 16 | 13485086750 |
[3,12,10,50,306,1788,9420,54166,320796,1915104, 11251252,65388276,380648010,2245338222, 13485086750] |