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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 91 |
| 4 | 2548 |
| 5 | 111384 |
| 6 | 6852768 |
| 7 | 553361016 |
| 8 | 55804330152 |
| 9 | 6774025632340 |
| 10 | 962310111888300 |
| 11 | 156490840602392625 |
| 12 | 28622389306817092500 |
| 13 | 5804104057179375825000 |
| 14 | 1289547073500366035700000 |
| 15 | 310827567433642575691950000 |
| 16 | 80604345356574686019872460000 |
[1,1,6,91,2548,111384,6852768,553361016, 55804330152,6774025632340,962310111888300, 156490840602392625,28622389306817092500, 5804104057179375825000,1289547073500366035700000, 310827567433642575691950000, 80604345356574686019872460000] |