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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 432 |
| 2 | 39312 |
| 3 | -1711296 |
| 4 | -14159664 |
| 5 | 317412000 |
| 6 | 5783500224 |
| 7 | 47251354752 |
| 8 | 263098098000 |
| 9 | 1138294453104 |
| 10 | 4105673192160 |
| 11 | 12882680040384 |
| 12 | 36171259008192 |
| 13 | 92764213434144 |
| 14 | 220523509245312 |
| 15 | 491705284878720 |
| 16 | 1037366470830672 |
| 17 | 2086141009345632 |
| 18 | 4022101701933264 |
[1,432,39312,-1711296,-14159664,317412000, 5783500224,47251354752,263098098000,1138294453104, 4105673192160,12882680040384,36171259008192, 92764213434144,220523509245312,491705284878720, 1037366470830672,2086141009345632, 4022101701933264] |