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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 0 |
| 3 | 16 |
| 4 | 0 |
| 5 | -252 |
| 6 | 0 |
| 7 | 4800 |
| 8 | 0 |
| 9 | -100100 |
| 10 | 0 |
| 11 | 2201472 |
| 12 | 0 |
| 13 | -50139936 |
| 14 | 0 |
| 15 | 1170614016 |
| 16 | 0 |
| 17 | -27839740500 |
| 18 | 0 |
| 19 | 671626956000 |
| 20 | 0 |
| 21 | -16388657193480 |
| 22 | 0 |
| 23 | 403645030064640 |
| 24 | 0 |
| 25 | -10018806017062752 |
| 26 | 0 |
| 27 | 250305475771456000 |
| 28 | 0 |
| 29 | -6288594802355952000 |
| 30 | 0 |
| 31 | 158759294846918261760 |
[1,-2,0,16,0,-252,0,4800,0,-100100,0,2201472,0, -50139936,0,1170614016,0,-27839740500,0, 671626956000,0,-16388657193480,0,403645030064640, 0,-10018806017062752,0,250305475771456000,0, -6288594802355952000,0,158759294846918261760] |