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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | 801 |
| 3 | 16040 |
| 4 | 642401 |
| 5 | 12864060 |
| 6 | 515204801 |
| 7 | 10316960080 |
| 8 | 413193608001 |
| 9 | 8274189120100 |
| 10 | 331380758412001 |
| 11 | 6635889357360120 |
| 12 | 265766955052816801 |
| 13 | 5321974990413696140 |
| 14 | 213144766571600662401 |
| 15 | 4268217306422426944160 |
| 16 | 170941837023468678428801 |
[1,20,801,16040,642401,12864060,515204801, 10316960080,413193608001,8274189120100, 331380758412001,6635889357360120, 265766955052816801,5321974990413696140, 213144766571600662401,4268217306422426944160, 170941837023468678428801] |