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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 5 |
| 5 | 35 |
| 6 | 410 |
| 7 | 6178 |
| 8 | 122038 |
| 9 | 2921607 |
| 10 | 81609320 |
| 11 | 2588949454 |
| 12 | 91699869557 |
| 13 | 3582942335285 |
| 14 | 153048366545566 |
| 15 | 7096576775166579 |
| 16 | 355120233277118103 |
| 17 | 19084972486216897560 |
| 18 | 1096965038775477639368 |
| 19 | 67192642484367187943761 |
| 20 | 4372413334294007638726854 |
[1,5,35,410,6178,122038,2921607,81609320, 2588949454,91699869557,3582942335285, 153048366545566,7096576775166579, 355120233277118103,19084972486216897560, 1096965038775477639368,67192642484367187943761, 4372413334294007638726854] |