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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 80 |
| 2 | 3160 |
| 3 | 82160 |
| 4 | 1581580 |
| 5 | 24040016 |
| 6 | 300500200 |
| 7 | 3176716400 |
| 8 | 28987537150 |
| 9 | 231900297200 |
| 10 | 1646492110120 |
| 11 | 10477677064400 |
| 12 | 60246643120300 |
| 13 | 315136287090800 |
| 14 | 1508152231077400 |
| 15 | 6635869816740560 |
| 16 | 26958221130508525 |
| 17 | 101489773667796800 |
[1,80,3160,82160,1581580,24040016,300500200, 3176716400,28987537150,231900297200,1646492110120, 10477677064400,60246643120300,315136287090800, 1508152231077400,6635869816740560, 26958221130508525,101489773667796800] |