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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 506 |
| 4 | 3935 |
| 5 | 30072 |
| 6 | 226247 |
| 7 | 1681860 |
| 8 | 12411486 |
| 9 | 91384716 |
| 10 | 671639928 |
| 11 | 4929577344 |
| 12 | 36146749703 |
| 13 | 264885341958 |
| 14 | 1940349607935 |
| 15 | 14210290469006 |
| 16 | 104055436365169 |
| 17 | 761877093233402 |
| 18 | 5577987879867728 |
| 19 | 40836880075623272 |
[8,64,506,3935,30072,226247,1681860,12411486, 91384716,671639928,4929577344,36146749703, 264885341958,1940349607935,14210290469006, 104055436365169,761877093233402,5577987879867728, 40836880075623272] |