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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 14 |
| 5 | 13 |
| 6 | 4 |
| 7 | 6 |
| 8 | 102 |
| 9 | 268 |
| 10 | 219 |
| 11 | 66 |
| 12 | 8 |
| 13 | 24 |
| 14 | 828 |
| 15 | 4668 |
| 16 | 7909 |
| 17 | 5309 |
| 18 | 1659 |
| 19 | 248 |
| 20 | 16 |
| 21 | 120 |
| 22 | 7500 |
| 23 | 80100 |
| 24 | 248870 |
| 25 | 303932 |
| 26 | 175783 |
| 27 | 53465 |
| 28 | 8950 |
| 29 | 800 |
| 30 | 32 |
| 31 | 720 |
| 32 | 75240 |
| 33 | 1411680 |
| 34 | 7476690 |
| 35 | 15207810 |
| 36 | 14504410 |
| 37 | 7361796 |
| 38 | 2150541 |
| 39 | 376375 |
| 40 | 39540 |
[1,1,2,2,14,13,4,6,102,268,219,66,8,24,828,4668, 7909,5309,1659,248,16,120,7500,80100,248870, 303932,175783,53465,8950,800,32,720,75240,1411680, 7476690,15207810,14504410,7361796,2150541,376375, 39540] |