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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 60 |
| 5 | 211 |
| 6 | 804 |
| 7 | 3154 |
| 8 | 12245 |
| 9 | 49553 |
| 10 | 203027 |
| 11 | 827595 |
| 12 | 3454623 |
| 13 | 14536494 |
| 14 | 60950967 |
| 15 | 259576170 |
| 16 | 1111789372 |
| 17 | 4749638623 |
| 18 | 20516611834 |
| 19 | 88993314253 |
| 20 | 385309493927 |
| 21 | 1682004955319 |
| 22 | 7366061233621 |
| 23 | 32214848084060 |
| 24 | 141781525659879 |
| 25 | 625587835019168 |
| 26 | 2757533681009154 |
| 27 | 12215807614024620 |
[1,2,5,17,60,211,804,3154,12245,49553,203027, 827595,3454623,14536494,60950967,259576170, 1111789372,4749638623,20516611834,88993314253, 385309493927,1682004955319,7366061233621, 32214848084060,141781525659879,625587835019168, 2757533681009154,12215807614024620] |