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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 51 |
| 6 | 286 |
| 7 | 1886 |
| 8 | 14309 |
| 9 | 122814 |
| 10 | 1176694 |
| 11 | 12450056 |
| 12 | 144181969 |
| 13 | 1814053266 |
| 14 | 24640186003 |
| 15 | 359363840295 |
| 16 | 5601100988553 |
| 17 | 92910896970409 |
| 18 | 1634289749459611 |
| 19 | 30384383699244134 |
| 20 | 595344239332647506 |
[1,1,1,3,11,51,286,1886,14309,122814,1176694, 12450056,144181969,1814053266,24640186003, 359363840295,5601100988553,92910896970409, 1634289749459611,30384383699244134, 595344239332647506] |