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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 2 |
| 3 | 15 |
| 4 | 20 |
| 5 | 6 |
| 6 | 84 |
| 7 | 168 |
| 8 | 105 |
| 9 | 20 |
| 10 | 495 |
| 11 | 1320 |
| 12 | 1260 |
| 13 | 504 |
| 14 | 70 |
| 15 | 3003 |
| 16 | 10010 |
| 17 | 12870 |
| 18 | 7920 |
| 19 | 2310 |
| 20 | 252 |
| 21 | 18564 |
| 22 | 74256 |
| 23 | 120120 |
| 24 | 100100 |
| 25 | 45045 |
| 26 | 10296 |
| 27 | 924 |
| 28 | 116280 |
| 29 | 542640 |
| 30 | 1058148 |
| 31 | 1113840 |
| 32 | 680680 |
| 33 | 240240 |
| 34 | 45045 |
| 35 | 3432 |
[1,3,2,15,20,6,84,168,105,20,495,1320,1260,504,70, 3003,10010,12870,7920,2310,252,18564,74256,120120, 100100,45045,10296,924,116280,542640,1058148, 1113840,680680,240240,45045,3432] |