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| n | a(n) |
|---|---|
| 1 | 56 |
| 2 | 266 |
| 3 | 1187 |
| 4 | 4584 |
| 5 | 17010 |
| 6 | 58892 |
| 7 | 198325 |
| 8 | 642908 |
| 9 | 2043150 |
| 10 | 6344716 |
| 11 | 19418611 |
| 12 | 58538770 |
| 13 | 174569904 |
| 14 | 515123368 |
| 15 | 1507602967 |
| 16 | 4378408682 |
| 17 | 12635495950 |
| 18 | 36252368030 |
| 19 | 103495137889 |
| 20 | 294126992350 |
| 21 | 832586122466 |
| 22 | 2348335515958 |
[56,266,1187,4584,17010,58892,198325,642908, 2043150,6344716,19418611,58538770,174569904, 515123368,1507602967,4378408682,12635495950, 36252368030,103495137889,294126992350, 832586122466,2348335515958] |