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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 28 |
| 3 | 128 |
| 4 | 480 |
| 5 | 2008 |
| 6 | 7776 |
| 7 | 31672 |
| 8 | 124528 |
| 9 | 500792 |
| 10 | 1982144 |
| 11 | 7926808 |
| 12 | 31474832 |
| 13 | 125567832 |
| 14 | 499339552 |
| 15 | 1989964024 |
| 16 | 7918843056 |
| 17 | 31542845816 |
| 18 | 125560568192 |
| 19 | 500031498968 |
| 20 | 1990726198480 |
| 21 | 7927069429912 |
| 22 | 31561303322592 |
| 23 | 125671455827384 |
[1,8,28,128,480,2008,7776,31672,124528,500792, 1982144,7926808,31474832,125567832,499339552, 1989964024,7918843056,31542845816,125560568192, 500031498968,1990726198480,7927069429912, 31561303322592,125671455827384] |