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| n | a(n) |
|---|---|
| 30 | 120 |
| 31 | 0 |
| 32 | 480 |
| 33 | 0 |
| 34 | 1800 |
| 35 | 0 |
| 36 | 5580 |
| 37 | 0 |
| 38 | 16224 |
| 39 | 0 |
| 40 | 43884 |
| 41 | 0 |
| 42 | 111828 |
| 43 | 5040 |
| 44 | 295752 |
| 45 | 90720 |
| 46 | 918144 |
| 47 | 836640 |
| 48 | 3717552 |
| 49 | 5937840 |
| 50 | 18033888 |
| 51 | 36198000 |
| 52 | 92552004 |
| 53 | 199157040 |
| 54 | 468066444 |
| 55 | 1018608720 |
| 56 | 2283162630 |
| 57 | 4928557200 |
| 58 | 10715965290 |
| 59 | 22825049040 |
| 60 | 48562957800 |
| 61 | 102021279960 |
[120,0,480,0,1800,0,5580,0,16224,0,43884,0,111828, 5040,295752,90720,918144,836640,3717552,5937840, 18033888,36198000,92552004,199157040,468066444, 1018608720,2283162630,4928557200,10715965290, 22825049040,48562957800,102021279960] |