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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 6 |
| 4 | 32 |
| 5 | 170 |
| 6 | 1038 |
| 7 | 6419 |
| 8 | 39528 |
| 9 | 260163 |
| 10 | 1718940 |
| 11 | 11576741 |
| 12 | 79305984 |
| 13 | 549330964 |
| 14 | 3845685592 |
| 15 | 27164175570 |
| 16 | 193374857264 |
[2,6,32,170,1038,6419,39528,260163,1718940, 11576741,79305984,549330964,3845685592, 27164175570,193374857264] |