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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | 294 |
| 3 | 3804 |
| 4 | 45881 |
| 5 | 529308 |
| 6 | 5921820 |
| 7 | 64781900 |
| 8 | 696650580 |
| 9 | 7391238736 |
| 10 | 77568523822 |
| 11 | 806770798500 |
| 12 | 8328009400398 |
| 13 | 85417717917288 |
| 14 | 871280511426936 |
| 15 | 8844707030389164 |
| 16 | 89408619343690220 |
| 17 | 900444396245910768 |
| 18 | 9038422593653829688 |
| 19 | 90455699063988431856 |
| 20 | 902846885411835421209 |
[1,20,294,3804,45881,529308,5921820,64781900, 696650580,7391238736,77568523822,806770798500, 8328009400398,85417717917288,871280511426936, 8844707030389164,89408619343690220, 900444396245910768,9038422593653829688, 90455699063988431856,902846885411835421209] |