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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 484 |
| 3 | 2932 |
| 4 | 17824 |
| 5 | 108272 |
| 6 | 655100 |
| 7 | 3970468 |
| 8 | 24093844 |
| 9 | 146112996 |
| 10 | 885471428 |
| 11 | 5368434004 |
| 12 | 32556604804 |
| 13 | 197396153396 |
| 14 | 1196688738212 |
| 15 | 7255631320212 |
| 16 | 43993941478852 |
| 17 | 266737613009204 |
| 18 | 1617205521101540 |
| 19 | 9805281128974548 |
[81,484,2932,17824,108272,655100,3970468,24093844, 146112996,885471428,5368434004,32556604804, 197396153396,1196688738212,7255631320212, 43993941478852,266737613009204,1617205521101540, 9805281128974548] |