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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 44 |
| 6 | 55 |
| 7 | 1434 |
| 8 | 3913 |
| 9 | 39752 |
| 10 | 392481 |
| 11 | 5109290 |
| 12 | 34683451 |
| 13 | 914698212 |
| 14 | 5777487703 |
| 15 | 91494090674 |
| 16 | 1504751645265 |
| 17 | 31764834185744 |
| 18 | 379862450767873 |
| 19 | 12634073744624082 |
| 20 | 132945783064464691 |
| 21 | 2753044719709341980 |
| 22 | 64135578414076991031 |
| 23 | 1822831113987975441482 |
[1,0,1,2,3,44,55,1434,3913,39752,392481,5109290, 34683451,914698212,5777487703,91494090674, 1504751645265,31764834185744,379862450767873, 12634073744624082,132945783064464691, 2753044719709341980,64135578414076991031, 1822831113987975441482] |