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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 4 |
| 3 | 62 |
| 4 | 1384 |
| 5 | 50522 |
| 6 | 2702764 |
| 7 | 199360982 |
| 8 | 19391512144 |
| 9 | 2404879675442 |
| 10 | 370371188237524 |
| 11 | 69348874393137902 |
| 12 | 15514534163557086904 |
| 13 | 4087072509293123892362 |
| 14 | 1252259641403629865468284 |
| 15 | 441543893249023104553682822 |
| 16 | 177519391579539289436664789664 |
[0,2,4,62,1384,50522,2702764,199360982, 19391512144,2404879675442,370371188237524, 69348874393137902,15514534163557086904, 4087072509293123892362,1252259641403629865468284, 441543893249023104553682822, 177519391579539289436664789664] |