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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 0 |
| 5 | -38 |
| 6 | -96 |
| 7 | 182 |
| 8 | 896 |
| 9 | -7118 |
| 10 | 9344 |
| 11 | 828102 |
| 12 | -1723392 |
| 13 | -107900726 |
| 14 | 271324928 |
| 15 | 18234006902 |
| 16 | -59548864512 |
| 17 | -4075490338462 |
| 18 | 16721045069824 |
| 19 | 1171273052028934 |
| 20 | -5792347300708352 |
| 21 | -420782912153339462 |
[1,2,4,6,0,-38,-96,182,896,-7118,9344,828102, -1723392,-107900726,271324928,18234006902, -59548864512,-4075490338462,16721045069824, 1171273052028934,-5792347300708352, -420782912153339462] |