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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 264 |
| 3 | 9882 |
| 4 | 131200 |
| 5 | 976875 |
| 6 | 5039496 |
| 7 | 20178004 |
| 8 | 67110912 |
| 9 | 193713525 |
| 10 | 500005000 |
| 11 | 1178981166 |
| 12 | 2579900544 |
| 13 | 5302263967 |
| 14 | 10330542600 |
| 15 | 19221705000 |
| 16 | 34359771136 |
| 17 | 59293980009 |
| 18 | 99179697672 |
| 19 | 161343914050 |
| 20 | 256000080000 |
[0,1,264,9882,131200,976875,5039496,20178004, 67110912,193713525,500005000,1178981166, 2579900544,5302263967,10330542600,19221705000, 34359771136,59293980009,99179697672,161343914050, 256000080000] |