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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 93 |
| 4 | 1848 |
| 5 | 49194 |
| 6 | 1646352 |
| 7 | 66471138 |
| 8 | 3145730760 |
| 9 | 170825968008 |
| 10 | 10472450056632 |
| 11 | 715494753359352 |
| 12 | 53913145327125840 |
| 13 | 4441896708946850880 |
| 14 | 397268517350608957440 |
| 15 | 38332384702788360859344 |
| 16 | 3969252425402471222357760 |
| 17 | 439043217473917940361120000 |
[1,1,7,93,1848,49194,1646352,66471138,3145730760, 170825968008,10472450056632,715494753359352, 53913145327125840,4441896708946850880, 397268517350608957440,38332384702788360859344, 3969252425402471222357760, 439043217473917940361120000] |