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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 172 |
| 5 | 1025 |
| 6 | 54606 |
| 7 | 710017 |
| 8 | 38964024 |
| 9 | 855167553 |
| 10 | 49992166090 |
| 11 | 1603665906161 |
| 12 | 101454726848388 |
| 13 | 4342187407054081 |
| 14 | 299554876119595110 |
| 15 | 16084216120063348545 |
| 16 | 1213404824364026124016 |
| 17 | 78279943651487041769345 |
| 18 | 6456915976418046368634402 |
[1,0,2,3,172,1025,54606,710017,38964024,855167553, 49992166090,1603665906161,101454726848388, 4342187407054081,299554876119595110, 16084216120063348545,1213404824364026124016, 78279943651487041769345,6456915976418046368634402] |