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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 12 |
| 4 | 51 |
| 5 | 18426 |
| 6 | 69876 |
| 7 | 6168162 |
| 8 | 12105501 |
| 9 | 17759001 |
| 10 | 3008521945 |
| 11 | 100938635992 |
| 12 | 826471253301 |
| 13 | 3044088035830227 |
| 14 | 5889438558016867 |
| 15 | 55959294872171901 |
[0,1,12,51,18426,69876,6168162,12105501,17759001, 3008521945,100938635992,826471253301, 3044088035830227,5889438558016867, 55959294872171901] |