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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 4 |
| 6 | 12 |
| 7 | 19 |
| 8 | 19 |
| 9 | 46 |
| 10 | 70 |
| 11 | 70 |
| 12 | 162 |
| 13 | 239 |
| 14 | 239 |
| 15 | 504 |
| 16 | 726 |
| 17 | 726 |
| 18 | 1471 |
| 19 | 2062 |
| 20 | 2062 |
[1,1,1,2,4,4,12,19,19,46,70,70,162,239,239,504, 726,726,1471,2062,2062] |