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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | -12 |
| 5 | 60 |
| 6 | -570 |
| 7 | 3780 |
| 8 | -29568 |
| 9 | 169344 |
| 10 | -557160 |
| 11 | -13049520 |
| 12 | 375064008 |
| 13 | -7823848032 |
| 14 | 135678667488 |
| 15 | -2221166656800 |
| 16 | 32120158935552 |
| 17 | -397914002426496 |
| 18 | 2522488580207424 |
| 19 | 61215640433391744 |
[1,0,0,0,-12,60,-570,3780,-29568,169344,-557160, -13049520,375064008,-7823848032,135678667488, -2221166656800,32120158935552,-397914002426496, 2522488580207424,61215640433391744] |