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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 34 |
| 6 | 377 |
| 7 | 17711 |
| 8 | 9227465 |
| 9 | 225851433717 |
| 10 | 2880067194370816120 |
| 11 | 898923707008479989274290850145 |
| 12 | 3577855662560905981638959513147239988861837901112 |
| 13 | 4444705723234237498833973519982908519933430818636409166351397897095281987215864 |
[1,1,2,3,8,34,377,17711,9227465,225851433717, 2880067194370816120, 898923707008479989274290850145, 3577855662560905981638959513147239988861837901112, 44447057232342374988339735199829085199334308186364\ 09166351397897095281987215864] |