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| n | a(n) |
|---|---|
| 2 | 6 |
| 3 | 336 |
| 4 | 3795 |
| 5 | 23520 |
| 6 | 102795 |
| 7 | 355656 |
| 8 | 1039626 |
| 9 | 2674440 |
| 10 | 6223140 |
| 11 | 13354440 |
| 12 | 26807781 |
| 13 | 50885016 |
| 14 | 92095185 |
| 15 | 159981360 |
| 16 | 268161060 |
| 17 | 435614256 |
| 18 | 688255506 |
| 19 | 1060829280 |
| 20 | 1599170055 |
| 21 | 2362871280 |
| 22 | 3428409831 |
| 23 | 4892775096 |
| 24 | 6877654350 |
[6,336,3795,23520,102795,355656,1039626,2674440, 6223140,13354440,26807781,50885016,92095185, 159981360,268161060,435614256,688255506, 1060829280,1599170055,2362871280,3428409831, 4892775096,6877654350] |