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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 11 |
| 4 | 66 |
| 5 | 1417 |
| 6 | 178803 |
| 7 | 275379307 |
| 8 | 15254411521973 |
| 9 | 108800468645440803267 |
| 10 | 964567296140908420613296779144 |
| 11 | 219614169629364529542990295052656098001967511 |
| 12 | 38626966436500261962963100479469496821891576834974275502742922521 |
[1,2,4,11,66,1417,178803,275379307,15254411521973, 108800468645440803267, 964567296140908420613296779144, 219614169629364529542990295052656098001967511, 38626966436500261962963100479469496821891576834974\ 275502742922521] |