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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 0 |
| 5 | -32 |
| 6 | -24 |
| 7 | 640 |
| 8 | 2176 |
| 9 | -16832 |
| 10 | -138496 |
| 11 | 521216 |
| 12 | 10367616 |
| 13 | -8750336 |
| 14 | -942458368 |
| 15 | -2101041920 |
| 16 | 102567493632 |
| 17 | 621205094400 |
| 18 | -12985904205824 |
| 19 | -148249466093568 |
| 20 | 1832574587011072 |
| 21 | 36650477053591552 |
| 22 | -266274589196877824 |
| 23 | -9888178289857134592 |
| 24 | 31088700594998902784 |
[1,2,4,6,0,-32,-24,640,2176,-16832,-138496,521216, 10367616,-8750336,-942458368,-2101041920, 102567493632,621205094400,-12985904205824, -148249466093568,1832574587011072, 36650477053591552,-266274589196877824, -9888178289857134592,31088700594998902784] |