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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 681 |
| 3 | 148905 |
| 4 | 64805265 |
| 5 | 46896669225 |
| 6 | 50831084252025 |
| 7 | 77061447551313225 |
| 8 | 155672917524626126625 |
| 9 | 404153655359180645543625 |
| 10 | 1311161072449806104077175625 |
| 11 | 5197766162779913140792304555625 |
| 12 | 24721993179513170562351592437800625 |
| 13 | 138944861938899421852917299018079515625 |
[1,9,681,148905,64805265,46896669225, 50831084252025,77061447551313225, 155672917524626126625,404153655359180645543625, 1311161072449806104077175625, 5197766162779913140792304555625, 24721993179513170562351592437800625, 138944861938899421852917299018079515625] |