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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 0 |
| 5 | 2 |
| 6 | 0 |
| 7 | 0 |
| 8 | 3 |
| 9 | 6 |
| 10 | 0 |
| 11 | 0 |
| 12 | 8 |
| 13 | 24 |
| 14 | 24 |
| 15 | 0 |
| 16 | 0 |
| 17 | 10 |
| 18 | 170 |
| 19 | 180 |
| 20 | 120 |
| 21 | 0 |
| 22 | 0 |
| 23 | 54 |
| 24 | 900 |
| 25 | 1980 |
| 26 | 1440 |
| 27 | 720 |
| 28 | 0 |
| 29 | 0 |
| 30 | -42 |
| 31 | 6566 |
| 32 | 19530 |
| 33 | 21840 |
| 34 | 12600 |
| 35 | 5040 |
| 36 | 0 |
| 37 | 0 |
| 38 | 944 |
| 39 | 44072 |
| 40 | 224112 |
| 41 | 305760 |
| 42 | 248640 |
| 43 | 120960 |
| 44 | 40320 |
| 45 | 0 |
| 46 | 0 |
| 47 | -5112 |
| 48 | 365256 |
| 49 | 2650536 |
| 50 | 4818744 |
| 51 | 4536000 |
| 52 | 2993760 |
| 53 | 1270080 |
| 54 | 362880 |
[1,0,1,0,0,2,0,0,3,6,0,0,8,24,24,0,0,10,170,180, 120,0,0,54,900,1980,1440,720,0,0,-42,6566,19530, 21840,12600,5040,0,0,944,44072,224112,305760, 248640,120960,40320,0,0,-5112,365256,2650536, 4818744,4536000,2993760,1270080,362880] |