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A057786 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 27 |
| 6 | 85 |
| 7 | 262 |
| 8 | 873 |
| 9 | 2917 |
| 10 | 10011 |
| 11 | 34561 |
| 12 | 120815 |
| 13 | 424468 |
| 14 | 1501441 |
| 15 | 5334181 |
| 16 | 19035075 |
| 17 | 68167472 |
| 18 | 244928324 |
| 19 | 882555803 |
| 20 | 3188480899 |
| 21 | 11546307356 |
| 22 | 41901879156 |
| 23 | 152359984459 |
| 24 | 554991766194 |
| 25 | 2024964145507 |
[1,2,4,10,27,85,262,873,2917,10011,34561,120815, 424468,1501441,5334181,19035075,68167472, 244928324,882555803,3188480899,11546307356, 41901879156,152359984459,554991766194, 2024964145507] |