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| n | a(n) |
|---|---|
| 1 | 28 |
| 2 | 104 |
| 3 | 408 |
| 4 | 1616 |
| 5 | 6432 |
| 6 | 25664 |
| 7 | 102528 |
| 8 | 409856 |
| 9 | 1638912 |
| 10 | 6554624 |
| 11 | 26216448 |
| 12 | 104861696 |
| 13 | 419438592 |
| 14 | 1677737984 |
| 15 | 6710919168 |
| 16 | 26843611136 |
| 17 | 107374313472 |
| 18 | 429496991744 |
| 19 | 1717987442688 |
| 20 | 6871948722176 |
| 21 | 27487792791552 |
| 22 | 109951166971904 |
[28,104,408,1616,6432,25664,102528,409856,1638912, 6554624,26216448,104861696,419438592,1677737984, 6710919168,26843611136,107374313472,429496991744, 1717987442688,6871948722176,27487792791552, 109951166971904] |