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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 12 |
| 5 | 462 |
| 6 | 10296 |
| 7 | 184848 |
| 8 | 3010632 |
| 9 | 46867734 |
| 10 | 714602604 |
| 11 | 10794487872 |
| 12 | 162393700356 |
| 13 | 2438841262254 |
| 14 | 36600358759728 |
| 15 | 549110847639168 |
| 16 | 8237281198316304 |
| 17 | 123562802759399382 |
| 18 | 1853462610207713988 |
[1,4,14,12,462,10296,184848,3010632,46867734, 714602604,10794487872,162393700356,2438841262254, 36600358759728,549110847639168,8237281198316304, 123562802759399382,1853462610207713988] |