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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 64 |
| 3 | 4225 |
| 4 | 278784 |
| 5 | 18395521 |
| 6 | 1213825600 |
| 7 | 80094094081 |
| 8 | 5284996383744 |
| 9 | 348729667233025 |
| 10 | 23010873040995904 |
| 11 | 1518368891038496641 |
| 12 | 100189335935499782400 |
| 13 | 6610977802851947141761 |
| 14 | 436224345652293011573824 |
[0,1,64,4225,278784,18395521,1213825600, 80094094081,5284996383744,348729667233025, 23010873040995904,1518368891038496641, 100189335935499782400,6610977802851947141761, 436224345652293011573824] |