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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -2 |
| 3 | 1 |
| 4 | 0 |
| 5 | 6 |
| 6 | 1 |
| 7 | 4 |
| 8 | -6 |
| 9 | -20 |
| 10 | 1 |
| 11 | 10 |
| 12 | 36 |
| 13 | 0 |
| 14 | 70 |
| 15 | 1 |
| 16 | 18 |
| 17 | 300 |
| 18 | 400 |
| 19 | 90 |
| 20 | -252 |
| 21 | 1 |
| 22 | 28 |
| 23 | 1050 |
| 24 | 11440 |
| 25 | 4900 |
| 26 | 0 |
| 27 | 924 |
| 28 | 1 |
| 29 | 40 |
| 30 | 2646 |
| 31 | 77616 |
| 32 | 485100 |
| 33 | 63504 |
| 34 | -1680 |
| 35 | -3432 |
| 36 | 1 |
| 37 | 54 |
| 38 | 5544 |
| 39 | 316540 |
| 40 | 6370650 |
| 41 | 21841260 |
| 42 | 853776 |
| 43 | 0 |
| 44 | 12870 |
| 45 | 1 |
| 46 | 70 |
| 47 | 10296 |
| 48 | 972400 |
| 49 | 42031990 |
| 50 | 554822268 |
| 51 | 1022041020 |
| 52 | 11778624 |
| 53 | 34650 |
| 54 | -48620 |
[1,1,-2,1,0,6,1,4,-6,-20,1,10,36,0,70,1,18,300, 400,90,-252,1,28,1050,11440,4900,0,924,1,40,2646, 77616,485100,63504,-1680,-3432,1,54,5544,316540, 6370650,21841260,853776,0,12870,1,70,10296,972400, 42031990,554822268,1022041020,11778624,34650, -48620] |