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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -3 |
| 3 | 6 |
| 4 | 12 |
| 5 | -325 |
| 6 | 3275 |
| 7 | -21238 |
| 8 | 2128 |
| 9 | 2873229 |
| 10 | -59980543 |
| 11 | 767451894 |
| 12 | -4032383300 |
| 13 | -119489497257 |
| 14 | 4880007568319 |
| 15 | -104393287284518 |
| 16 | 1240478290057792 |
| 17 | 10284007879438201 |
| 18 | -1108679036024621403 |
| 19 | 37101253954089817798 |
[0,1,-3,6,12,-325,3275,-21238,2128,2873229, -59980543,767451894,-4032383300,-119489497257, 4880007568319,-104393287284518,1240478290057792, 10284007879438201,-1108679036024621403, 37101253954089817798] |