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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 21 |
| 5 | 351 |
| 6 | 43956 |
| 7 | 187578 |
| 8 | 246753 |
| 9 | 570846 |
| 10 | 1200475 |
| 11 | 4890628 |
| 12 | 15671601 |
| 13 | 83663580 |
| 14 | 442903203 |
| 15 | 3776109156 |
| 16 | 35358717628 |
| 17 | 1060996913571 |
| 18 | 2443123072855 |
| 19 | 65801068940503 |
| 20 | 598914888327003 |
| 21 | 1364298098094561 |
[0,1,3,21,351,43956,187578,246753,570846,1200475, 4890628,15671601,83663580,442903203,3776109156, 35358717628,1060996913571,2443123072855, 65801068940503,598914888327003,1364298098094561] |