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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 122 |
| 5 | 2676 |
| 6 | 75197 |
| 7 | 2548336 |
| 8 | 100461956 |
| 9 | 4500071172 |
| 10 | 225305924896 |
| 11 | 12456434569184 |
| 12 | 753380353835754 |
| 13 | 49473301917640864 |
| 14 | 3505613955205438686 |
| 15 | 266627715169575108168 |
| 16 | 21667902182055638829520 |
| 17 | 1873978995774161192935320 |
| 18 | 171874439346918445003163152 |
[1,1,8,122,2676,75197,2548336,100461956, 4500071172,225305924896,12456434569184, 753380353835754,49473301917640864, 3505613955205438686,266627715169575108168, 21667902182055638829520,1873978995774161192935320, 171874439346918445003163152] |