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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 30 |
| 5 | 1 |
| 6 | 0 |
| 7 | 150 |
| 8 | 240 |
| 9 | 1 |
| 10 | 0 |
| 11 | 240 |
| 12 | 6810 |
| 13 | 1020 |
| 14 | 1 |
| 15 | 0 |
| 16 | 120 |
| 17 | 63540 |
| 18 | 94890 |
| 19 | 3120 |
| 20 | 1 |
| 21 | 0 |
| 22 | 0 |
| 23 | 271170 |
| 24 | 2615340 |
| 25 | 740640 |
| 26 | 7770 |
| 27 | 1 |
| 28 | 0 |
| 29 | 0 |
| 30 | 604800 |
| 31 | 32186070 |
| 32 | 47271840 |
| 33 | 4029690 |
| 34 | 16800 |
| 35 | 1 |
| 36 | 0 |
| 37 | 0 |
| 38 | 730800 |
| 39 | 214628400 |
| 40 | 1281612570 |
| 41 | 518276640 |
| 42 | 17075940 |
| 43 | 32760 |
| 44 | 1 |
| 45 | 0 |
| 46 | 0 |
| 47 | 453600 |
| 48 | 859992000 |
| 49 | 18459063000 |
| 50 | 26947757970 |
| 51 | 4027831080 |
| 52 | 60171300 |
| 53 | 59040 |
| 54 | 1 |
[1,0,1,0,30,1,0,150,240,1,0,240,6810,1020,1,0,120, 63540,94890,3120,1,0,0,271170,2615340,740640,7770, 1,0,0,604800,32186070,47271840,4029690,16800,1,0, 0,730800,214628400,1281612570,518276640,17075940, 32760,1,0,0,453600,859992000,18459063000, 26947757970,4027831080,60171300,59040,1] |