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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 20 |
| 3 | 329 |
| 4 | 22584 |
| 5 | 7938470 |
| 6 | 12605643936 |
| 7 | 84977963809781 |
| 8 | 2379247465188706528 |
| 9 | 273419351336298753589802 |
| 10 | 128009562526607810326874017088 |
| 11 | 242979581192696030760182903464959706 |
[1,3,20,329,22584,7938470,12605643936, 84977963809781,2379247465188706528, 273419351336298753589802, 128009562526607810326874017088, 242979581192696030760182903464959706] |