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| n | a(n) |
|---|---|
| 1 | 26 |
| 2 | 676 |
| 3 | 2080 |
| 4 | 9672 |
| 5 | 41444 |
| 6 | 181896 |
| 7 | 794768 |
| 8 | 3479268 |
| 9 | 15223104 |
| 10 | 66632488 |
| 11 | 291591092 |
| 12 | 1276262520 |
| 13 | 5585326656 |
| 14 | 24445752916 |
| 15 | 106984774208 |
| 16 | 468241205640 |
| 17 | 2049246237012 |
| 18 | 8968858409576 |
| 19 | 39252328435216 |
| 20 | 171793006303620 |
[26,676,2080,9672,41444,181896,794768,3479268, 15223104,66632488,291591092,1276262520,5585326656, 24445752916,106984774208,468241205640, 2049246237012,8968858409576,39252328435216, 171793006303620] |