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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 3 |
| 6 | 0 |
| 7 | 8 |
| 8 | 3 |
| 9 | 0 |
| 10 | 20 |
| 11 | 30 |
| 12 | 0 |
| 13 | 48 |
| 14 | 210 |
| 15 | 15 |
| 16 | 0 |
| 17 | 112 |
| 18 | 1260 |
| 19 | 315 |
| 20 | 0 |
| 21 | 256 |
| 22 | 6944 |
| 23 | 4200 |
| 24 | 105 |
| 25 | 0 |
| 26 | 576 |
| 27 | 36288 |
| 28 | 45360 |
| 29 | 3780 |
| 30 | 0 |
| 31 | 1280 |
| 32 | 182880 |
| 33 | 433440 |
| 34 | 81900 |
| 35 | 945 |
| 36 | 0 |
| 37 | 2816 |
| 38 | 897600 |
| 39 | 3825360 |
| 40 | 1386000 |
| 41 | 51975 |
| 42 | 0 |
| 43 | 6144 |
| 44 | 4316928 |
| 45 | 31944000 |
| 46 | 20207880 |
| 47 | 1663200 |
| 48 | 10395 |
[1,0,0,1,0,3,0,8,3,0,20,30,0,48,210,15,0,112,1260, 315,0,256,6944,4200,105,0,576,36288,45360,3780,0, 1280,182880,433440,81900,945,0,2816,897600, 3825360,1386000,51975,0,6144,4316928,31944000, 20207880,1663200,10395] |