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| n | a(n) |
|---|---|
| 0 | 8 |
| 1 | 64 |
| 2 | 568 |
| 3 | 5104 |
| 4 | 45928 |
| 5 | 413344 |
| 6 | 3720088 |
| 7 | 33480784 |
| 8 | 301327048 |
| 9 | 2711943424 |
| 10 | 24407490808 |
| 11 | 219667417264 |
| 12 | 1977006755368 |
| 13 | 17793060798304 |
| 14 | 160137547184728 |
| 15 | 1441237924662544 |
| 16 | 12971141321962888 |
| 17 | 116740271897665984 |
| 18 | 1050662447078993848 |
| 19 | 9455962023710944624 |
| 20 | 85103658213398501608 |
[8,64,568,5104,45928,413344,3720088,33480784, 301327048,2711943424,24407490808,219667417264, 1977006755368,17793060798304,160137547184728, 1441237924662544,12971141321962888, 116740271897665984,1050662447078993848, 9455962023710944624,85103658213398501608] |