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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 6 |
| 5 | 6 |
| 6 | 1 |
| 7 | 18 |
| 8 | 42 |
| 9 | 26 |
| 10 | 1 |
| 11 | 58 |
| 12 | 252 |
| 13 | 344 |
| 14 | 150 |
| 15 | 1 |
| 16 | 190 |
| 17 | 1420 |
| 18 | 3380 |
| 19 | 3230 |
| 20 | 1082 |
| 21 | 1 |
| 22 | 614 |
| 23 | 7770 |
| 24 | 29200 |
| 25 | 47130 |
| 26 | 34452 |
| 27 | 9366 |
[1,1,2,1,6,6,1,18,42,26,1,58,252,344,150,1,190, 1420,3380,3230,1082,1,614,7770,29200,47130,34452, 9366] |