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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 93 |
| 4 | 1544 |
| 5 | 32615 |
| 6 | 843264 |
| 7 | 25739539 |
| 8 | 906373376 |
| 9 | 36163950849 |
| 10 | 1612483625600 |
| 11 | 79458277381901 |
| 12 | 4288069172500992 |
| 13 | 251520785449249927 |
| 14 | 15932801526165085184 |
| 15 | 1084003570689331039875 |
| 16 | 78835487923639854792704 |
| 17 | 6103175938145968656408641 |
| 18 | 501114006272655771562911744 |
[1,1,8,93,1544,32615,843264,25739539,906373376, 36163950849,1612483625600,79458277381901, 4288069172500992,251520785449249927, 15932801526165085184,1084003570689331039875, 78835487923639854792704,6103175938145968656408641, 501114006272655771562911744] |