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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 312 |
| 4 | 6304 |
| 5 | 105766 |
| 6 | 1488168 |
| 7 | 19173138 |
| 8 | 233189094 |
| 9 | 2717934337 |
| 10 | 30694746766 |
| 11 | 338284153075 |
| 12 | 3655878921594 |
| 13 | 38880261356722 |
| 14 | 407983475386552 |
| 15 | 4232650810058466 |
| 16 | 43484119577595732 |
| 17 | 442946653502633411 |
[0,6,312,6304,105766,1488168,19173138,233189094, 2717934337,30694746766,338284153075,3655878921594, 38880261356722,407983475386552,4232650810058466, 43484119577595732,442946653502633411] |