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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 1 |
| 5 | 10 |
| 6 | 1382 |
| 7 | 28 |
| 8 | 3617 |
| 9 | 87734 |
| 10 | 349222 |
| 11 | 3418052 |
| 12 | 472728182 |
| 13 | 34212412 |
| 14 | 94997844116 |
| 15 | 68926730208040 |
| 16 | 7709321041217 |
| 17 | 5155375716734 |
| 18 | 52630543106106954746 |
| 19 | 11719975655366236 |
| 20 | 522165436992898244102 |
[1,1,1,2,1,10,1382,28,3617,87734,349222,3418052, 472728182,34212412,94997844116,68926730208040, 7709321041217,5155375716734,52630543106106954746, 11719975655366236,522165436992898244102] |