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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 9 |
| 5 | 119 |
| 6 | 4935 |
| 7 | 596763 |
| 8 | 211517867 |
| 9 | 224663223092 |
| 10 | 734961197081208 |
| 11 | 7614278809664610952 |
| 12 | 256261752606028225485183 |
| 13 | 28642174350851846128820426827 |
| 14 | 10830277060032417592098008847162727 |
| 15 | 14068379226083299071248895931891435683229 |
[0,1,1,2,9,119,4935,596763,211517867,224663223092, 734961197081208,7614278809664610952, 256261752606028225485183, 28642174350851846128820426827, 10830277060032417592098008847162727, 14068379226083299071248895931891435683229] |