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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 61 |
| 3 | 130 |
| 4 | 1767 |
| 5 | 13279 |
| 6 | 100942 |
| 7 | 839935 |
| 8 | 6803634 |
| 9 | 54261600 |
| 10 | 441840835 |
| 11 | 3569262964 |
| 12 | 28807241168 |
| 13 | 233159844870 |
| 14 | 1884661005225 |
| 15 | 15233397819139 |
| 16 | 123179691694152 |
| 17 | 995827871395574 |
| 18 | 8050733022232712 |
| 19 | 65089574008016784 |
| 20 | 526225152552918970 |
[0,61,130,1767,13279,100942,839935,6803634, 54261600,441840835,3569262964,28807241168, 233159844870,1884661005225,15233397819139, 123179691694152,995827871395574,8050733022232712, 65089574008016784,526225152552918970] |