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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 100 |
| 3 | 2940 |
| 4 | 132192 |
| 5 | 8368360 |
| 6 | 705938688 |
| 7 | 76289850000 |
| 8 | 10252702720000 |
| 9 | 1674156061141344 |
| 10 | 326009771116646400 |
| 11 | 74554986880418359744 |
| 12 | 19767651264345600000000 |
| 13 | 6010708728599919162000000 |
| 14 | 2076396132003401567272173568 |
| 15 | 808279585896351070399895712000 |
[1,6,100,2940,132192,8368360,705938688, 76289850000,10252702720000,1674156061141344, 326009771116646400,74554986880418359744, 19767651264345600000000,6010708728599919162000000, 2076396132003401567272173568, 808279585896351070399895712000] |