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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 16 |
| 4 | 92 |
| 5 | 1816 |
| 6 | 47344 |
| 7 | 4888640 |
| 8 | 546663016 |
| 9 | 245429690704 |
| 10 | 113080892367776 |
| 11 | 209848258185362560 |
| 12 | 393950238751186551328 |
| 13 | 2976605303522286162203456 |
| 14 | 22642571073509592590956639360 |
| 15 | 692351532949951721637759480882688 |
[1,2,4,16,92,1816,47344,4888640,546663016, 245429690704,113080892367776,209848258185362560, 393950238751186551328,2976605303522286162203456, 22642571073509592590956639360, 692351532949951721637759480882688] |