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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 45 |
| 2 | 1143 |
| 3 | 21615 |
| 4 | 339273 |
| 5 | 4678245 |
| 6 | 58635291 |
| 7 | 683043075 |
| 8 | 7509979620 |
| 9 | 78804997700 |
| 10 | 795761196516 |
| 11 | 7781553124020 |
| 12 | 74052668067768 |
| 13 | 688495224545640 |
| 14 | 6273531262685808 |
| 15 | 56167899323785920 |
| 16 | 495164048016313071 |
| 17 | 4305882857891533875 |
| 18 | 36989093846561967825 |
| 19 | 314291267108824487625 |
[1,45,1143,21615,339273,4678245,58635291, 683043075,7509979620,78804997700,795761196516, 7781553124020,74052668067768,688495224545640, 6273531262685808,56167899323785920, 495164048016313071,4305882857891533875, 36989093846561967825,314291267108824487625] |