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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 66 |
| 4 | 1170 |
| 5 | 34786 |
| 6 | 1083188 |
| 7 | 31513702 |
| 8 | 918670552 |
| 9 | 26923332502 |
| 10 | 788665534214 |
| 11 | 23096502615266 |
| 12 | 676415379783970 |
| 13 | 19810153530144730 |
| 14 | 580179175498127842 |
| 15 | 16991673670981870826 |
| 16 | 497634173760064848450 |
| 17 | 14574184574564194067466 |
[0,0,66,1170,34786,1083188,31513702,918670552, 26923332502,788665534214,23096502615266, 676415379783970,19810153530144730, 580179175498127842,16991673670981870826, 497634173760064848450,14574184574564194067466] |