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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 14 |
| 4 | 170 |
| 5 | 2904 |
| 6 | 74779 |
| 7 | 2751790 |
| 8 | 137080628 |
| 9 | 8882440224 |
| 10 | 726325289493 |
| 11 | 73173672616318 |
| 12 | 8906815805139614 |
| 13 | 1288823180820993752 |
| 14 | 218690604655001166063 |
| 15 | 43009037666992387906942 |
| 16 | 9705063652363696926178792 |
| 17 | 2490696756572714604529691648 |
| 18 | 721374035463654709543727643561 |
[0,1,14,170,2904,74779,2751790,137080628, 8882440224,726325289493,73173672616318, 8906815805139614,1288823180820993752, 218690604655001166063,43009037666992387906942, 9705063652363696926178792, 2490696756572714604529691648, 721374035463654709543727643561] |