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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 28 |
| 3 | 704 |
| 4 | 768 |
| 5 | 311296 |
| 6 | 1507328 |
| 7 | 3145728 |
| 8 | 130023424 |
| 9 | 7516192768 |
| 10 | 12884901888 |
| 11 | 2954937499648 |
| 12 | 12919261626368 |
| 13 | 52776558133248 |
| 14 | 774056185954304 |
| 15 | 66428094503714816 |
| 16 | 31525197391593472 |
| 17 | 308982963234634989568 |
[3,28,704,768,311296,1507328,3145728,130023424, 7516192768,12884901888,2954937499648, 12919261626368,52776558133248,774056185954304, 66428094503714816,31525197391593472, 308982963234634989568] |