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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 302 |
| 3 | 3762 |
| 4 | 43923 |
| 5 | 497223 |
| 6 | 5545264 |
| 7 | 61398804 |
| 8 | 677478725 |
| 9 | 7463074905 |
| 10 | 82149266706 |
| 11 | 903924739926 |
| 12 | 9944608539607 |
| 13 | 109397965416267 |
| 14 | 1203414334895828 |
| 15 | 13237742692094328 |
| 16 | 145616100380861769 |
[1,21,302,3762,43923,497223,5545264,61398804, 677478725,7463074905,82149266706,903924739926, 9944608539607,109397965416267,1203414334895828, 13237742692094328,145616100380861769] |