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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 258 |
| 4 | 6184 |
| 5 | 195660 |
| 6 | 7674144 |
| 7 | 358788696 |
| 8 | 19464910000 |
| 9 | 1201543131276 |
| 10 | 83134800597280 |
| 11 | 6371436086078382 |
| 12 | 535715287899894216 |
| 13 | 49025879014213908144 |
| 14 | 4850781409411286177248 |
| 15 | 515964243167132532702480 |
| 16 | 58710263012322890445554400 |
[1,2,16,258,6184,195660,7674144,358788696, 19464910000,1201543131276,83134800597280, 6371436086078382,535715287899894216, 49025879014213908144,4850781409411286177248, 515964243167132532702480, 58710263012322890445554400] |