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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 10 |
| 4 | 10 |
| 5 | 70 |
| 6 | 167 |
| 7 | 70 |
| 8 | 420 |
| 9 | 1720 |
| 10 | 1720 |
| 11 | 420 |
| 12 | 2310 |
| 13 | 14065 |
| 14 | 24164 |
| 15 | 14065 |
| 16 | 2310 |
| 17 | 12012 |
| 18 | 100156 |
| 19 | 256116 |
| 20 | 256116 |
| 21 | 100156 |
| 22 | 12012 |
| 23 | 60060 |
| 24 | 649950 |
| 25 | 2278660 |
| 26 | 3392843 |
| 27 | 2278660 |
| 28 | 649950 |
| 29 | 60060 |
| 30 | 291720 |
| 31 | 3944928 |
| 32 | 17970784 |
| 33 | 36703824 |
| 34 | 36703824 |
| 35 | 17970784 |
[1,10,10,70,167,70,420,1720,1720,420,2310,14065, 24164,14065,2310,12012,100156,256116,256116, 100156,12012,60060,649950,2278660,3392843,2278660, 649950,60060,291720,3944928,17970784,36703824, 36703824,17970784] |