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A009125 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | -3 |
| 4 | 20 |
| 5 | -120 |
| 6 | 976 |
| 7 | -8568 |
| 8 | 88640 |
| 9 | -1011840 |
| 10 | 12933376 |
| 11 | -180964608 |
| 12 | 2767631360 |
| 13 | -45799004160 |
| 14 | 816582578176 |
| 15 | -15594628021248 |
| 16 | 317710534983680 |
| 17 | -6876762625966080 |
| 18 | 157606194409701376 |
| 19 | -3812723805066559488 |
[1,0,1,-3,20,-120,976,-8568,88640,-1011840, 12933376,-180964608,2767631360,-45799004160, 816582578176,-15594628021248,317710534983680, -6876762625966080,157606194409701376, -3812723805066559488] |