The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -5 |
| 2 | -23 |
| 3 | 60 |
| 4 | 2639 |
| 5 | -3860 |
| 6 | -272663 |
| 7 | 501620 |
| 8 | 31166879 |
| 9 | -110918628 |
| 10 | -1687132265 |
| 11 | 37412868100 |
| 12 | 309061800748829 |
| 13 | -17890334121556 |
| 14 | -378440509880321 |
| 15 | 11515290969710100 |
| 16 | 23654820881827875103 |
| 17 | -9600023754736584644 |
| 18 | -34710906792092949023741 |
[1,-5,-23,60,2639,-3860,-272663,501620,31166879, -110918628,-1687132265,37412868100, 309061800748829,-17890334121556,-378440509880321, 11515290969710100,23654820881827875103, -9600023754736584644,-34710906792092949023741] |