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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 13 |
| 4 | 166 |
| 5 | 3324 |
| 6 | 92718 |
| 7 | 3354712 |
| 8 | 150206430 |
| 9 | 8050991676 |
| 10 | 504049958320 |
| 11 | 36172232930282 |
| 12 | 2931474921768206 |
| 13 | 265078092222575572 |
| 14 | 26480336590135734816 |
| 15 | 2898139377307388441520 |
| 16 | 345055687960080723910286 |
[1,1,2,13,166,3324,92718,3354712,150206430, 8050991676,504049958320,36172232930282, 2931474921768206,265078092222575572, 26480336590135734816,2898139377307388441520, 345055687960080723910286] |