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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 207 |
| 4 | 6856 |
| 5 | 302345 |
| 6 | 17812656 |
| 7 | 1384059775 |
| 8 | 131612023936 |
| 9 | 14986421437329 |
| 10 | 2051598980742400 |
| 11 | 327546779949753551 |
| 12 | 59790068922261980160 |
| 13 | 12505503377433451819993 |
| 14 | 2956768061598853524176896 |
| 15 | 778675046844529953944661375 |
| 16 | 228393818322135051214683406336 |
[1,1,10,207,6856,302345,17812656,1384059775, 131612023936,14986421437329,2051598980742400, 327546779949753551,59790068922261980160, 12505503377433451819993,2956768061598853524176896, 778675046844529953944661375, 228393818322135051214683406336] |