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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 33 |
| 5 | 556 |
| 6 | 31781 |
| 7 | 5882230 |
| 8 | 3589936407 |
| 9 | 7347418294141 |
| 10 | 51304793433150418 |
| 11 | 1240428029662246026001 |
| 12 | 105148289475978338858008298 |
| 13 | 31582581551955332317665959184087 |
[1,1,2,5,33,556,31781,5882230,3589936407, 7347418294141,51304793433150418, 1240428029662246026001, 105148289475978338858008298, 31582581551955332317665959184087] |