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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 16 |
| 3 | -144 |
| 4 | 36 |
| 5 | 2304 |
| 6 | -960 |
| 7 | 96 |
| 8 | -57600 |
| 9 | 24000 |
| 10 | -3600 |
| 11 | 200 |
| 12 | 2073600 |
| 13 | -864000 |
| 14 | 146880 |
| 15 | -11520 |
| 16 | 360 |
| 17 | -101606400 |
| 18 | 42336000 |
| 19 | -7197120 |
| 20 | 635040 |
| 21 | -29400 |
| 22 | 588 |
| 23 | 6502809600 |
| 24 | -2709504000 |
| 25 | 460615680 |
| 26 | -41932800 |
| 27 | 2204160 |
| 28 | -64512 |
| 29 | 896 |
[0,16,-144,36,2304,-960,96,-57600,24000,-3600,200, 2073600,-864000,146880,-11520,360,-101606400, 42336000,-7197120,635040,-29400,588,6502809600, -2709504000,460615680,-41932800,2204160,-64512, 896] |