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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 189 |
| 4 | 927 |
| 5 | 2889 |
| 6 | 11727 |
| 7 | 40581 |
| 8 | 154359 |
| 9 | 554733 |
| 10 | 2062215 |
| 11 | 7512453 |
| 12 | 27700479 |
| 13 | 101402109 |
| 14 | 372809655 |
| 15 | 1367107173 |
| 16 | 5021003151 |
| 17 | 18423673101 |
| 18 | 67639822407 |
| 19 | 248247487989 |
| 20 | 911283026751 |
| 21 | 3344800820445 |
| 22 | 12277727839863 |
| 23 | 45065827217925 |
[9,81,189,927,2889,11727,40581,154359,554733, 2062215,7512453,27700479,101402109,372809655, 1367107173,5021003151,18423673101,67639822407, 248247487989,911283026751,3344800820445, 12277727839863,45065827217925] |