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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 126 |
| 3 | 1568 |
| 4 | 756 |
| 5 | -165312 |
| 6 | -1227240 |
| 7 | 19894464 |
| 8 | 414106686 |
| 9 | -456317568 |
| 10 | -96106099320 |
| 11 | -809737207776 |
| 12 | 15047550684488 |
| 13 | 345938324437440 |
| 14 | -318788546956992 |
| 15 | -91256560218798912 |
| 16 | -842108390970746508 |
| 17 | 15331399952805675648 |
| 18 | 380895013380314119302 |
| 19 | -178390965727200705696 |
[1,0,126,1568,756,-165312,-1227240,19894464, 414106686,-456317568,-96106099320,-809737207776, 15047550684488,345938324437440,-318788546956992, -91256560218798912,-842108390970746508, 15331399952805675648,380895013380314119302, -178390965727200705696] |