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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 2 |
| 4 | 13 |
| 5 | 30 |
| 6 | 24 |
| 7 | 6 |
| 8 | 75 |
| 9 | 372 |
| 10 | 780 |
| 11 | 872 |
| 12 | 546 |
| 13 | 180 |
| 14 | 24 |
| 15 | 541 |
| 16 | 4660 |
| 17 | 18180 |
| 18 | 42140 |
| 19 | 64150 |
| 20 | 66900 |
| 21 | 48320 |
| 22 | 23820 |
| 23 | 7650 |
| 24 | 1440 |
| 25 | 120 |
| 26 | 4683 |
| 27 | 62130 |
| 28 | 385980 |
| 29 | 1487520 |
| 30 | 3973770 |
| 31 | 7789032 |
| 32 | 11565360 |
| 33 | 13238520 |
| 34 | 11771130 |
| 35 | 8124710 |
| 36 | 4314420 |
| 37 | 1729440 |
| 38 | 506010 |
| 39 | 101880 |
| 40 | 12600 |
| 41 | 720 |
[1,1,3,2,13,30,24,6,75,372,780,872,546,180,24,541, 4660,18180,42140,64150,66900,48320,23820,7650, 1440,120,4683,62130,385980,1487520,3973770, 7789032,11565360,13238520,11771130,8124710, 4314420,1729440,506010,101880,12600,720] |