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| n | a(n) |
|---|---|
| 5 | 2 |
| 6 | 5 |
| 7 | 16 |
| 8 | 55 |
| 9 | 208 |
| 10 | 817 |
| 11 | 3336 |
| 12 | 13935 |
| 13 | 59406 |
| 14 | 257079 |
| 15 | 1126948 |
| 16 | 4992421 |
| 17 | 22318048 |
| 18 | 100546543 |
| 19 | 456055730 |
| 20 | 2080872845 |
| 21 | 9544572590 |
| 22 | 43984730855 |
| 23 | 203550840696 |
| 24 | 945562887981 |
| 25 | 4407586685688 |
| 26 | 20609668887723 |
| 27 | 96646196091276 |
| 28 | 454402001079165 |
[2,5,16,55,208,817,3336,13935,59406,257079, 1126948,4992421,22318048,100546543,456055730, 2080872845,9544572590,43984730855,203550840696, 945562887981,4407586685688,20609668887723, 96646196091276,454402001079165] |