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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 292 |
| 4 | 1651 |
| 5 | 9504 |
| 6 | 52072 |
| 7 | 289776 |
| 8 | 1617326 |
| 9 | 8992115 |
| 10 | 50039730 |
| 11 | 278556885 |
| 12 | 1550225927 |
| 13 | 8627663414 |
| 14 | 48018101493 |
| 15 | 267244802833 |
| 16 | 1487352476813 |
| 17 | 8277889631533 |
| 18 | 46070713404315 |
| 19 | 256407195751421 |
| 20 | 1427038070447781 |
[8,64,292,1651,9504,52072,289776,1617326,8992115, 50039730,278556885,1550225927,8627663414, 48018101493,267244802833,1487352476813, 8277889631533,46070713404315,256407195751421, 1427038070447781] |