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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -1 |
| 3 | -3 |
| 4 | -9 |
| 5 | -35 |
| 6 | -195 |
| 7 | -1477 |
| 8 | -13839 |
| 9 | -151335 |
| 10 | -1877745 |
| 11 | -26022491 |
| 12 | -398318481 |
| 13 | -6674043961 |
| 14 | -121496905803 |
| 15 | -2387748622365 |
| 16 | -50382638237343 |
| 17 | -1136006690370371 |
| 18 | -27257495551671753 |
| 19 | -693436310776781083 |
| 20 | -18643640290958926785 |
| 21 | -528196548501606911913 |
[1,0,-1,-3,-9,-35,-195,-1477,-13839,-151335, -1877745,-26022491,-398318481,-6674043961, -121496905803,-2387748622365,-50382638237343, -1136006690370371,-27257495551671753, -693436310776781083,-18643640290958926785, -528196548501606911913] |