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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 30 |
| 6 | 89 |
| 7 | 292 |
| 8 | 979 |
| 9 | 3400 |
| 10 | 12343 |
| 11 | 45414 |
| 12 | 171339 |
| 13 | 658069 |
| 14 | 2563330 |
| 15 | 10148718 |
| 16 | 40637220 |
| 17 | 164466898 |
| 18 | 672375792 |
| 19 | 2772055955 |
| 20 | 11523056929 |
| 21 | 48249869722 |
| 22 | 203337220125 |
| 23 | 862137480843 |
| 24 | 3675561131454 |
| 25 | 15750515059157 |
| 26 | 67817588931961 |
| 27 | 293278774651265 |
| 28 | 1273450290226531 |
| 29 | 5550464963189884 |
[1,1,2,4,10,30,89,292,979,3400,12343,45414,171339, 658069,2563330,10148718,40637220,164466898, 672375792,2772055955,11523056929,48249869722, 203337220125,862137480843,3675561131454, 15750515059157,67817588931961,293278774651265, 1273450290226531,5550464963189884] |