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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 68 |
| 3 | 1176 |
| 4 | 27152 |
| 5 | 783456 |
| 6 | 27126848 |
| 7 | 1095801216 |
| 8 | 50589024512 |
| 9 | 2627443262976 |
| 10 | 151623974601728 |
| 11 | 9624874873952256 |
| 12 | 666516443992297472 |
| 13 | 50002158357801885696 |
| 14 | 4039720490206565777408 |
| 15 | 349685083067909962039296 |
| 16 | 32287291853754803207340032 |
| 17 | 3167488677197974581176303616 |
[1,6,68,1176,27152,783456,27126848,1095801216, 50589024512,2627443262976,151623974601728, 9624874873952256,666516443992297472, 50002158357801885696,4039720490206565777408, 349685083067909962039296, 32287291853754803207340032, 3167488677197974581176303616] |