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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 124 |
| 5 | 725 |
| 6 | 28146 |
| 7 | 352807 |
| 8 | 14395256 |
| 9 | 298559529 |
| 10 | 13269150190 |
| 11 | 394087597211 |
| 12 | 19361289265044 |
| 13 | 752705527798237 |
| 14 | 41083484117561354 |
| 15 | 1970818974867113295 |
| 16 | 119467697774656366576 |
| 17 | 6792102349650727753553 |
| 18 | 455778318504089893121766 |
[1,0,2,3,124,725,28146,352807,14395256,298559529, 13269150190,394087597211,19361289265044, 752705527798237,41083484117561354, 1970818974867113295,119467697774656366576, 6792102349650727753553,455778318504089893121766] |