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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 87 |
| 4 | 20112 |
| 5 | 13130451 |
| 6 | 20592419760 |
| 7 | 68480747646822 |
| 8 | 439844417498287872 |
| 9 | 5071434436872671368032 |
| 10 | 98967158653968381405705552 |
| 11 | 3114311420263883442781958758440 |
| 12 | 151767050607668644623432327234864384 |
[0,2,87,20112,13130451,20592419760,68480747646822, 439844417498287872,5071434436872671368032, 98967158653968381405705552, 3114311420263883442781958758440, 151767050607668644623432327234864384] |