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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 28 |
| 3 | 78 |
| 4 | 334 |
| 5 | 1516 |
| 6 | 6329 |
| 7 | 27110 |
| 8 | 118085 |
| 9 | 519355 |
| 10 | 2275485 |
| 11 | 10007094 |
| 12 | 44192714 |
| 13 | 194914769 |
| 14 | 860631159 |
| 15 | 3804114731 |
| 16 | 16808740747 |
| 17 | 74300020431 |
| 18 | 328513615351 |
| 19 | 1452355332413 |
| 20 | 6421729825720 |
| 21 | 28395939285931 |
| 22 | 125559090180746 |
[8,28,78,334,1516,6329,27110,118085,519355, 2275485,10007094,44192714,194914769,860631159, 3804114731,16808740747,74300020431,328513615351, 1452355332413,6421729825720,28395939285931, 125559090180746] |