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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 24 |
| 4 | 238 |
| 5 | 2180 |
| 6 | 19184 |
| 7 | 164864 |
| 8 | 1395230 |
| 9 | 11683212 |
| 10 | 97083652 |
| 11 | 802098704 |
| 12 | 6597442768 |
| 13 | 54074559968 |
| 14 | 441952039104 |
| 15 | 3603658886144 |
| 16 | 29327060440350 |
| 17 | 238277193572828 |
| 18 | 1933262776766876 |
[2,24,238,2180,19184,164864,1395230,11683212, 97083652,802098704,6597442768,54074559968, 441952039104,3603658886144,29327060440350, 238277193572828,1933262776766876] |