The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | -7 |
| 4 | -15 |
| 5 | 33 |
| 6 | 145 |
| 7 | -71 |
| 8 | -1119 |
| 9 | -767 |
| 10 | 7137 |
| 11 | 13625 |
| 12 | -35567 |
| 13 | -138079 |
| 14 | 97265 |
| 15 | 1099385 |
| 16 | 556609 |
| 17 | -7236351 |
| 18 | -12231999 |
| 19 | 37865849 |
| 20 | 130726193 |
| 21 | -122102751 |
| 22 | -1075051951 |
| 23 | -351058887 |
| 24 | 7296407521 |
| 25 | 10828871681 |
| 26 | -39894922079 |
| 27 | -122993431367 |
| 28 | 145442151505 |
| 29 | 1046291093153 |
[0,1,1,-7,-15,33,145,-71,-1119,-767,7137,13625, -35567,-138079,97265,1099385,556609,-7236351, -12231999,37865849,130726193,-122102751, -1075051951,-351058887,7296407521,10828871681, -39894922079,-122993431367,145442151505, 1046291093153] |