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| n | a(n) |
|---|---|
| 1 | 52 |
| 2 | 264 |
| 3 | 1256 |
| 4 | 5670 |
| 5 | 25023 |
| 6 | 108214 |
| 7 | 462970 |
| 8 | 1962897 |
| 9 | 8278491 |
| 10 | 34768983 |
| 11 | 145652451 |
| 12 | 608974557 |
| 13 | 2542990472 |
| 14 | 10609555831 |
| 15 | 44237987228 |
| 16 | 184378860260 |
| 17 | 768258530698 |
| 18 | 3200511193171 |
| 19 | 13331394907045 |
| 20 | 55525565937033 |
| 21 | 231251505598612 |
[52,264,1256,5670,25023,108214,462970,1962897, 8278491,34768983,145652451,608974557,2542990472, 10609555831,44237987228,184378860260,768258530698, 3200511193171,13331394907045,55525565937033, 231251505598612] |