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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 2 |
| 5 | 0 |
| 6 | 6 |
| 7 | 18 |
| 8 | 3 |
| 9 | 0 |
| 10 | 24 |
| 11 | 144 |
| 12 | 96 |
| 13 | 4 |
| 14 | 0 |
| 15 | 120 |
| 16 | 1200 |
| 17 | 1800 |
| 18 | 400 |
| 19 | 5 |
| 20 | 0 |
| 21 | 720 |
| 22 | 10800 |
| 23 | 28800 |
| 24 | 16200 |
| 25 | 1440 |
| 26 | 6 |
| 27 | 0 |
| 28 | 5040 |
| 29 | 105840 |
| 30 | 441000 |
| 31 | 470400 |
| 32 | 119070 |
| 33 | 4704 |
| 34 | 7 |
| 35 | 0 |
| 36 | 40320 |
| 37 | 1128960 |
| 38 | 6773760 |
| 39 | 11760000 |
| 40 | 6021120 |
| 41 | 762048 |
| 42 | 14336 |
| 43 | 8 |
| 44 | 0 |
| 45 | 362880 |
| 46 | 13063680 |
| 47 | 106686720 |
| 48 | 274337280 |
| 49 | 238140000 |
| 50 | 65028096 |
| 51 | 4408992 |
| 52 | 41472 |
| 53 | 9 |
| 54 | 0 |
[1,1,0,2,2,0,6,18,3,0,24,144,96,4,0,120,1200,1800, 400,5,0,720,10800,28800,16200,1440,6,0,5040, 105840,441000,470400,119070,4704,7,0,40320, 1128960,6773760,11760000,6021120,762048,14336,8,0, 362880,13063680,106686720,274337280,238140000, 65028096,4408992,41472,9,0] |