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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 144 |
| 5 | 3160 |
| 6 | 118380 |
| 7 | 7174188 |
| 8 | 692356896 |
| 9 | 104696597808 |
| 10 | 24680489921280 |
| 11 | 9010186432576560 |
| 12 | 5073501307520289600 |
| 13 | 4385657278007399474496 |
| 14 | 5797249519065509217375936 |
| 15 | 11674185903250032386477342880 |
| 16 | 35692663320428574506107140979200 |
[1,1,2,12,144,3160,118380,7174188,692356896, 104696597808,24680489921280,9010186432576560, 5073501307520289600,4385657278007399474496, 5797249519065509217375936, 11674185903250032386477342880, 35692663320428574506107140979200] |