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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 99 |
| 4 | 2608 |
| 5 | 90800 |
| 6 | 3835458 |
| 7 | 187727106 |
| 8 | 10356030404 |
| 9 | 632391914502 |
| 10 | 42217751766193 |
| 11 | 3053486035335835 |
| 12 | 237640678130730437 |
| 13 | 19794116975373467259 |
| 14 | 1756875217029906875379 |
| 15 | 165552614838271944281933 |
| 16 | 16509692094523556884973416 |
| 17 | 1737510282985845400007263814 |
[1,1,6,99,2608,90800,3835458,187727106, 10356030404,632391914502,42217751766193, 3053486035335835,237640678130730437, 19794116975373467259,1756875217029906875379, 165552614838271944281933, 16509692094523556884973416, 1737510282985845400007263814] |