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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 0 |
| 5 | 2 |
| 6 | -10 |
| 7 | 56 |
| 8 | -350 |
| 9 | 2390 |
| 10 | -17544 |
| 11 | 136846 |
| 12 | -1124794 |
| 13 | 9681832 |
| 14 | -86864206 |
| 15 | 809349770 |
| 16 | -7808871616 |
| 17 | 77836952362 |
| 18 | -800020218314 |
| 19 | 8465353891808 |
| 20 | -92095165316342 |
| 21 | 1028910894313302 |
| 22 | -11793279016419864 |
| 23 | 138555915579090830 |
| 24 | -1667276484211383794 |
| 25 | 20533971488794963168 |
[0,1,2,0,2,-10,56,-350,2390,-17544,136846, -1124794,9681832,-86864206,809349770,-7808871616, 77836952362,-800020218314,8465353891808, -92095165316342,1028910894313302, -11793279016419864,138555915579090830, -1667276484211383794,20533971488794963168] |