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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | 10 |
| 6 | 4 |
| 7 | 28 |
| 8 | 6 |
| 9 | 42 |
| 10 | 40 |
| 11 | 348 |
| 12 | 42 |
| 13 | 1060 |
| 14 | 226 |
| 15 | 998 |
| 16 | 886 |
| 17 | 21660 |
| 18 | 690 |
| 19 | 57696 |
| 20 | 4344 |
| 21 | 26660 |
| 22 | 22404 |
| 23 | 1091902 |
| 24 | 12142 |
| 25 | 1770008 |
[1,1,2,2,2,10,4,28,6,42,40,348,42,1060,226,998, 886,21660,690,57696,4344,26660,22404,1091902, 12142,1770008] |