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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 26460 |
| 3 | 288149400 |
| 4 | 11799717930000 |
| 5 | 1303467640855380000 |
| 6 | 318564884489773161240000 |
| 7 | 150951970515479012453574000000 |
| 8 | 126206413988876537942059614180000000 |
| 9 | 173464405707011357574463836709701000000000 |
| 10 | 370958141678992170468287850863450040726000000000 |
[1,18,26460,288149400,11799717930000, 1303467640855380000,318564884489773161240000, 150951970515479012453574000000, 126206413988876537942059614180000000, 173464405707011357574463836709701000000000, 370958141678992170468287850863450040726000000000] |