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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | -3 |
| 4 | 11 |
| 5 | -50 |
| 6 | 334 |
| 7 | -3024 |
| 8 | 32388 |
| 9 | -381744 |
| 10 | 4838076 |
| 11 | -65583540 |
| 12 | 950021940 |
| 13 | -14693894280 |
| 14 | 242272566600 |
| 15 | -4248337358160 |
| 16 | 79009205066400 |
| 17 | -1553851954502400 |
| 18 | 32222584311078480 |
| 19 | -702651673196884080 |
| 20 | 16071124886746959600 |
| 21 | -384653713958912916000 |
[0,0,1,-3,11,-50,334,-3024,32388,-381744,4838076, -65583540,950021940,-14693894280,242272566600, -4248337358160,79009205066400,-1553851954502400, 32222584311078480,-702651673196884080, 16071124886746959600,-384653713958912916000] |