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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 25 |
| 3 | 649 |
| 4 | 16921 |
| 5 | 448751 |
| 6 | 12160177 |
| 7 | 336745053 |
| 8 | 9513822745 |
| 9 | 273585035755 |
| 10 | 7988828082775 |
| 11 | 236367018090017 |
| 12 | 7072779699975601 |
| 13 | 213701611408357567 |
| 14 | 6511338458568750853 |
| 15 | 199850727914988936149 |
| 16 | 6173376842290368719385 |
| 17 | 191776434791965521115235 |
| 18 | 5987554996434696230487955 |
[0,1,25,649,16921,448751,12160177,336745053, 9513822745,273585035755,7988828082775, 236367018090017,7072779699975601, 213701611408357567,6511338458568750853, 199850727914988936149,6173376842290368719385, 191776434791965521115235, 5987554996434696230487955] |