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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 81 |
| 3 | 1173 |
| 4 | 18915 |
| 5 | 340563 |
| 6 | 6081561 |
| 7 | 108108231 |
| 8 | 1923264723 |
| 9 | 34219066161 |
| 10 | 608809697883 |
| 11 | 10831633601715 |
| 12 | 192711252863829 |
| 13 | 3428626492612815 |
| 14 | 61000479835023903 |
| 15 | 1085291316379044081 |
| 16 | 19308983258977687575 |
[0,81,1173,18915,340563,6081561,108108231, 1923264723,34219066161,608809697883, 10831633601715,192711252863829,3428626492612815, 61000479835023903,1085291316379044081, 19308983258977687575] |