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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 44 |
| 4 | 285 |
| 5 | 2028 |
| 6 | 15338 |
| 7 | 120960 |
| 8 | 983108 |
| 9 | 8172094 |
| 10 | 69116592 |
| 11 | 592590616 |
| 12 | 5136777504 |
| 13 | 44928712804 |
| 14 | 395907022448 |
| 15 | 3510622573064 |
| 16 | 31296093794827 |
| 17 | 280275392413204 |
| 18 | 2520017580255461 |
| 19 | 22736733105613548 |
| 20 | 205767848345966976 |
| 21 | 1867240544055742660 |
[1,2,8,44,285,2028,15338,120960,983108,8172094, 69116592,592590616,5136777504,44928712804, 395907022448,3510622573064,31296093794827, 280275392413204,2520017580255461, 22736733105613548,205767848345966976, 1867240544055742660] |