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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 30 |
| 4 | 396 |
| 5 | 6212 |
| 6 | 95412 |
| 7 | 1459082 |
| 8 | 22379112 |
| 9 | 343179162 |
| 10 | 5262047702 |
| 11 | 80687972676 |
| 12 | 1237264461260 |
| 13 | 18972099054156 |
| 14 | 290916616713522 |
| 15 | 4460891769710192 |
| 16 | 68402949461361234 |
| 17 | 1048885241311782830 |
| 18 | 16083520658051806236 |
[0,2,30,396,6212,95412,1459082,22379112,343179162, 5262047702,80687972676,1237264461260, 18972099054156,290916616713522,4460891769710192, 68402949461361234,1048885241311782830, 16083520658051806236] |