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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 144 |
| 4 | 576 |
| 5 | 1936 |
| 6 | 6400 |
| 7 | 21904 |
| 8 | 73984 |
| 9 | 250000 |
| 10 | 846400 |
| 11 | 2862864 |
| 12 | 9684544 |
| 13 | 32764176 |
| 14 | 110838784 |
| 15 | 374964496 |
| 16 | 1268499456 |
| 17 | 4291298064 |
| 18 | 14517358144 |
| 19 | 49111878544 |
| 20 | 166144281664 |
| 21 | 562062085264 |
| 22 | 1901442429184 |
| 23 | 6432533627536 |
[9,81,144,576,1936,6400,21904,73984,250000,846400, 2862864,9684544,32764176,110838784,374964496, 1268499456,4291298064,14517358144,49111878544, 166144281664,562062085264,1901442429184, 6432533627536] |