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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 17 |
| 4 | 399 |
| 5 | 73 |
| 6 | 44638 |
| 7 | 1570497 |
| 8 | 5077565 |
| 9 | 486784401 |
| 10 | 22187726197 |
| 11 | 166394893969 |
| 12 | 13800864889148 |
| 13 | 762517292682713 |
| 14 | 9603465430859099 |
| 15 | 803800832678655745 |
| 16 | 3180753925351614970 |
| 17 | 947615093635545799201 |
[0,1,8,17,399,73,44638,1570497,5077565,486784401, 22187726197,166394893969,13800864889148, 762517292682713,9603465430859099, 803800832678655745,3180753925351614970, 947615093635545799201] |