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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 10 |
| 5 | 45 |
| 6 | 176 |
| 7 | 1305 |
| 8 | 10079 |
| 9 | 117352 |
| 10 | 1561149 |
| 11 | 29980210 |
| 12 | 704867467 |
| 13 | 22571926686 |
| 14 | 912535595499 |
| 15 | 49246939684046 |
| 16 | 3416075823339525 |
| 17 | 312263317852780140 |
[1,4,10,45,176,1305,10079,117352,1561149,29980210, 704867467,22571926686,912535595499,49246939684046, 3416075823339525,312263317852780140] |