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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 35 |
| 3 | 168 |
| 4 | 756 |
| 5 | 3192 |
| 6 | 12936 |
| 7 | 50688 |
| 8 | 193479 |
| 9 | 722722 |
| 10 | 2651649 |
| 11 | 9581936 |
| 12 | 34176324 |
| 13 | 120526056 |
| 14 | 420852204 |
| 15 | 1456709328 |
| 16 | 5002984791 |
| 17 | 17062825626 |
| 18 | 57827993685 |
| 19 | 194871361608 |
| 20 | 653285629920 |
| 21 | 2179701604080 |
| 22 | 7241015510820 |
| 23 | 23958512912880 |
| 24 | 78978801164445 |
[1,6,35,168,756,3192,12936,50688,193479,722722, 2651649,9581936,34176324,120526056,420852204, 1456709328,5002984791,17062825626,57827993685, 194871361608,653285629920,2179701604080, 7241015510820,23958512912880,78978801164445] |