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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 104 |
| 3 | 2944 |
| 4 | 108136 |
| 5 | 4525888 |
| 6 | 204981888 |
| 7 | 9792786432 |
| 8 | 486323201640 |
| 9 | 24874892400064 |
| 10 | 1302278744460352 |
| 11 | 69474942954714112 |
| 12 | 3764568243058030208 |
| 13 | 206675027529594291200 |
| 14 | 11473858525271117889536 |
| 15 | 643154944963894079717376 |
| 16 | 36355546411928157876528744 |
| 17 | 2070313613815122857027563200 |
[1,8,104,2944,108136,4525888,204981888,9792786432, 486323201640,24874892400064,1302278744460352, 69474942954714112,3764568243058030208, 206675027529594291200,11473858525271117889536, 643154944963894079717376, 36355546411928157876528744, 2070313613815122857027563200] |