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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 7 |
| 5 | 25 |
| 6 | 55 |
| 7 | 208 |
| 8 | 1905 |
| 9 | 20926 |
| 10 | 172576 |
| 11 | 1900996 |
| 12 | 35023141 |
| 13 | 893053190 |
| 14 | 24012955958 |
| 15 | 788590457332 |
| 16 | 36088248750672 |
[1,7,25,55,208,1905,20926,172576,1900996,35023141, 893053190,24012955958,788590457332,36088248750672] |