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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | -15 |
| 5 | 70 |
| 6 | -354 |
| 7 | 1995 |
| 8 | -12667 |
| 9 | 89892 |
| 10 | -705244 |
| 11 | 6042575 |
| 12 | -55837075 |
| 13 | 548985138 |
| 14 | -5650236630 |
| 15 | 59493168735 |
| 16 | -615581655639 |
| 17 | 5683518687560 |
| 18 | -30016869620472 |
| 19 | -587400084741573 |
| 20 | 31322604753002761 |
| 21 | -1006072267431660450 |
[1,0,0,3,-15,70,-354,1995,-12667,89892,-705244, 6042575,-55837075,548985138,-5650236630, 59493168735,-615581655639,5683518687560, -30016869620472,-587400084741573, 31322604753002761,-1006072267431660450] |