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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 476 |
| 3 | 2766 |
| 4 | 15728 |
| 5 | 89630 |
| 6 | 511044 |
| 7 | 2913944 |
| 8 | 16611380 |
| 9 | 94699360 |
| 10 | 539880924 |
| 11 | 3077859284 |
| 12 | 17546758636 |
| 13 | 100033478620 |
| 14 | 570287962208 |
| 15 | 3251195031144 |
| 16 | 18534964466228 |
| 17 | 105667273378104 |
| 18 | 602405957212488 |
| 19 | 3434298293663288 |
[81,476,2766,15728,89630,511044,2913944,16611380, 94699360,539880924,3077859284,17546758636, 100033478620,570287962208,3251195031144, 18534964466228,105667273378104,602405957212488, 3434298293663288] |