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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 134 |
| 3 | 5052 |
| 4 | 267576 |
| 5 | 18246850 |
| 6 | 1521907056 |
| 7 | 150077897088 |
| 8 | 17080661438336 |
| 9 | 2203559337858174 |
| 10 | 317761804144896000 |
| 11 | 50650336389453807556 |
| 12 | 8843008543955452118016 |
| 13 | 1678231571506037926192698 |
| 14 | 343989152383931539269349376 |
| 15 | 75733086648535784012234565000 |
[1,6,134,5052,267576,18246850,1521907056, 150077897088,17080661438336,2203559337858174, 317761804144896000,50650336389453807556, 8843008543955452118016,1678231571506037926192698, 343989152383931539269349376, 75733086648535784012234565000] |