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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 29 |
| 5 | 81 |
| 6 | 541 |
| 7 | 3781 |
| 8 | 18537 |
| 9 | 129529 |
| 10 | 1171961 |
| 11 | 8446131 |
| 12 | 66198661 |
| 13 | 683784817 |
| 14 | 6492131829 |
| 15 | 59303102041 |
| 16 | 664191218321 |
| 17 | 7659196889841 |
| 18 | 82391350746097 |
| 19 | 991483941558079 |
| 20 | 13066764825298221 |
| 21 | 164001743446274161 |
| 22 | 2139651772557011021 |
| 23 | 30946063565684912877 |
[1,1,1,7,29,81,541,3781,18537,129529,1171961, 8446131,66198661,683784817,6492131829,59303102041, 664191218321,7659196889841,82391350746097, 991483941558079,13066764825298221, 164001743446274161,2139651772557011021, 30946063565684912877] |