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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | 1201 |
| 3 | 24040 |
| 4 | 1443601 |
| 5 | 28896060 |
| 6 | 1735207201 |
| 7 | 34733040080 |
| 8 | 2085717612001 |
| 9 | 41749085280100 |
| 10 | 2507030834418001 |
| 11 | 50182365773640120 |
| 12 | 3013448977252825201 |
| 13 | 60319161910830144140 |
| 14 | 3622163163627061473601 |
| 15 | 72503582434452059616160 |
[1,20,1201,24040,1443601,28896060,1735207201, 34733040080,2085717612001,41749085280100, 2507030834418001,50182365773640120, 3013448977252825201,60319161910830144140, 3622163163627061473601,72503582434452059616160] |