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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 81 |
| 3 | 389 |
| 4 | 1494 |
| 5 | 6905 |
| 6 | 34957 |
| 7 | 170262 |
| 8 | 800847 |
| 9 | 3803935 |
| 10 | 18365102 |
| 11 | 88560473 |
| 12 | 424619869 |
| 13 | 2035343158 |
| 14 | 9777295419 |
| 15 | 46988945099 |
| 16 | 225666735042 |
| 17 | 1083506611767 |
| 18 | 5203510168649 |
| 19 | 24992947298934 |
| 20 | 120035845319593 |
| 21 | 576475476282345 |
[8,81,389,1494,6905,34957,170262,800847,3803935, 18365102,88560473,424619869,2035343158,9777295419, 46988945099,225666735042,1083506611767, 5203510168649,24992947298934,120035845319593, 576475476282345] |