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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -3 |
| 3 | -21 |
| 4 | 75 |
| 5 | 1475 |
| 6 | -5005 |
| 7 | -221389 |
| 8 | 593523 |
| 9 | 57764619 |
| 10 | -89101881 |
| 11 | -23273632371 |
| 12 | 953636541 |
| 13 | 13409519997705 |
| 14 | 23908442020749 |
| 15 | -10469975115603501 |
| 16 | -40844292735050541 |
| 17 | 10646036726696597027 |
| 18 | 66995992524016223543 |
| 19 | -13672657170891872702719 |
| 20 | -122282221141986787179519 |
| 21 | 21647316686778755963070321 |
| 22 | 256325163531592225309743129 |
| 23 | -41426918732532942751217361155 |
| 24 | -620418821801458605268716606275 |
| 25 | 94275566307675915918535250768725 |
[1,1,-3,-21,75,1475,-5005,-221389,593523,57764619, -89101881,-23273632371,953636541,13409519997705, 23908442020749,-10469975115603501, -40844292735050541,10646036726696597027, 66995992524016223543,-13672657170891872702719, -122282221141986787179519, 21647316686778755963070321, 256325163531592225309743129, -41426918732532942751217361155, -620418821801458605268716606275, 94275566307675915918535250768725] |