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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 210 |
| 3 | 7140 |
| 4 | 242556 |
| 5 | 8239770 |
| 6 | 279909630 |
| 7 | 9508687656 |
| 8 | 323015470680 |
| 9 | 10973017315470 |
| 10 | 372759573255306 |
| 11 | 12662852473364940 |
| 12 | 430164224521152660 |
| 13 | 14612920781245825506 |
| 14 | 496409142337836914550 |
| 15 | 16863297918705209269200 |
| 16 | 572855720093639278238256 |
[0,6,210,7140,242556,8239770,279909630,9508687656, 323015470680,10973017315470,372759573255306, 12662852473364940,430164224521152660, 14612920781245825506,496409142337836914550, 16863297918705209269200,572855720093639278238256] |