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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 80 |
| 3 | 4794 |
| 4 | 280900 |
| 5 | 15836932 |
| 6 | 886416182 |
| 7 | 49491906456 |
| 8 | 2761454361344 |
| 9 | 154047246448662 |
| 10 | 8592994055896310 |
| 11 | 479322218408145970 |
| 12 | 26736736612809407136 |
| 13 | 1491380920762839897984 |
| 14 | 83189511828057155698994 |
[0,80,4794,280900,15836932,886416182,49491906456, 2761454361344,154047246448662,8592994055896310, 479322218408145970,26736736612809407136, 1491380920762839897984,83189511828057155698994] |