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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 17 |
| 5 | 65 |
| 6 | 292 |
| 7 | 1434 |
| 8 | 7875 |
| 9 | 47098 |
| 10 | 305226 |
| 11 | 2122983 |
| 12 | 15752080 |
| 13 | 124015310 |
| 14 | 1031857395 |
| 15 | 9041908204 |
| 16 | 83186138212 |
[1,1,2,5,17,65,292,1434,7875,47098,305226,2122983, 15752080,124015310,1031857395,9041908204, 83186138212] |