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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 6 |
| 4 | 3 |
| 5 | -5 |
| 6 | -2 |
| 7 | 24 |
| 8 | -16 |
| 9 | -64 |
| 10 | -24 |
| 11 | 120 |
| 12 | -350 |
| 13 | -679 |
| 14 | -151 |
| 15 | 74 |
| 16 | 16 |
| 17 | 720 |
| 18 | -5076 |
| 19 | -6746 |
| 20 | 1198 |
| 21 | 2692 |
| 22 | 544 |
| 23 | 5040 |
| 24 | -73332 |
| 25 | -55628 |
| 26 | 80239 |
| 27 | 68081 |
| 28 | 8858 |
| 29 | -2000 |
| 30 | -272 |
| 31 | 40320 |
| 32 | -1135296 |
| 33 | -18712 |
| 34 | 2522252 |
| 35 | 1417588 |
| 36 | -83312 |
| 37 | -155392 |
| 38 | -19840 |
| 39 | 362880 |
[1,2,2,6,3,-5,-2,24,-16,-64,-24,120,-350,-679, -151,74,16,720,-5076,-6746,1198,2692,544,5040, -73332,-55628,80239,68081,8858,-2000,-272,40320, -1135296,-18712,2522252,1417588,-83312,-155392, -19840,362880] |