The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 1 |
| 3 | -3 |
| 4 | 0 |
| 5 | 1 |
| 6 | 8 |
| 7 | -4 |
| 8 | -4 |
| 9 | 1 |
| 10 | -30 |
| 11 | 30 |
| 12 | 15 |
| 13 | -10 |
| 14 | 1 |
| 15 | 144 |
| 16 | -216 |
| 17 | -48 |
| 18 | 84 |
| 19 | -18 |
| 20 | 1 |
| 21 | -840 |
| 22 | 1680 |
| 23 | 0 |
| 24 | -700 |
| 25 | 245 |
| 26 | -28 |
| 27 | 1 |
| 28 | 5760 |
| 29 | -14400 |
| 30 | 2880 |
| 31 | 6000 |
| 32 | -3120 |
| 33 | 552 |
| 34 | -40 |
| 35 | 1 |
| 36 | -45360 |
| 37 | 136080 |
| 38 | -52920 |
| 39 | -52920 |
| 40 | 39690 |
| 41 | -9702 |
| 42 | 1071 |
| 43 | -54 |
| 44 | 1 |
| 45 | 403200 |
| 46 | -1411200 |
| 47 | 806400 |
| 48 | 470400 |
[0,2,1,-3,0,1,8,-4,-4,1,-30,30,15,-10,1,144,-216, -48,84,-18,1,-840,1680,0,-700,245,-28,1,5760, -14400,2880,6000,-3120,552,-40,1,-45360,136080, -52920,-52920,39690,-9702,1071,-54,1,403200, -1411200,806400,470400] |