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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 1 |
| 4 | 5 |
| 5 | 21 |
| 6 | 52 |
| 7 | 93 |
| 8 | 157 |
| 9 | 1615 |
| 10 | 3976 |
| 11 | 6063 |
| 12 | 38657 |
| 13 | 41029695 |
| 14 | 40060126 |
| 15 | 66408709 |
| 16 | 69552217 |
| 17 | 21794638335 |
| 18 | 1307902407752 |
| 19 | 355687428358143 |
| 20 | 355691118382363 |
| 21 | 10559506801336735 |
| 22 | 1267150213999726 |
| 23 | 2534272929378303 |
| 24 | 2548357888109546 |
| 25 | 1831184524199042148591 |
[0,1,5,21,52,93,157,1615,3976,6063,38657,41029695, 40060126,66408709,69552217,21794638335, 1307902407752,355687428358143,355691118382363, 10559506801336735,1267150213999726, 2534272929378303,2548357888109546, 1831184524199042148591] |