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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 13 |
| 5 | 197 |
| 6 | 4729 |
| 7 | 156806 |
| 8 | 7035482 |
| 9 | 505265569 |
| 10 | 82612843683 |
| 11 | 33651820752580 |
| 12 | 23922790371389972 |
| 13 | 25614853328191562332 |
| 14 | 43322613720440154974138 |
| 15 | 128405885225433787867253690 |
| 16 | 738840753928503040569961869076 |
| 17 | 8481241718402438554921627740308746 |
| 18 | 179685856472407342498054958799766397100 |
[0,0,1,13,197,4729,156806,7035482,505265569, 82612843683,33651820752580,23922790371389972, 25614853328191562332,43322613720440154974138, 128405885225433787867253690, 738840753928503040569961869076, 8481241718402438554921627740308746, 179685856472407342498054958799766397100] |