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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 14 |
| 3 | 290 |
| 4 | 6392 |
| 5 | 141696 |
| 6 | 3142704 |
| 7 | 69705920 |
| 8 | 1546100352 |
| 9 | 34293030016 |
| 10 | 760631058944 |
| 11 | 16871055411200 |
| 12 | 374205743270912 |
| 13 | 8300010573582336 |
| 14 | 184097055591849984 |
| 15 | 4083335265314938880 |
| 16 | 90569764059295875072 |
[1,14,290,6392,141696,3142704,69705920,1546100352, 34293030016,760631058944,16871055411200, 374205743270912,8300010573582336, 184097055591849984,4083335265314938880, 90569764059295875072] |