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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 7 |
| 4 | 40 |
| 5 | 182 |
| 6 | 744 |
| 7 | 4348 |
| 8 | 30316 |
| 9 | 201606 |
| 10 | 1325951 |
| 11 | 8712942 |
| 12 | 57420185 |
| 13 | 382468132 |
| 14 | 2579116980 |
| 15 | 17576618010 |
| 16 | 120833625953 |
[3,7,40,182,744,4348,30316,201606,1325951,8712942, 57420185,382468132,2579116980,17576618010, 120833625953] |