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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 6 |
| 4 | 60 |
| 5 | 432 |
| 6 | 60 |
| 7 | 450 |
| 8 | 11280 |
| 9 | 11280 |
| 10 | 450 |
| 11 | 3000 |
| 12 | 250992 |
| 13 | 943488 |
| 14 | 250992 |
| 15 | 3000 |
| 16 | 18750 |
| 17 | 5125008 |
| 18 | 68182800 |
| 19 | 68182800 |
| 20 | 5125008 |
| 21 | 18750 |
| 22 | 112500 |
| 23 | 99482544 |
| 24 | 4546948272 |
| 25 | 16086672048 |
| 26 | 4546948272 |
| 27 | 99482544 |
| 28 | 112500 |
| 29 | 656250 |
| 30 | 1867222224 |
[0,6,6,60,432,60,450,11280,11280,450,3000,250992, 943488,250992,3000,18750,5125008,68182800, 68182800,5125008,18750,112500,99482544,4546948272, 16086672048,4546948272,99482544,112500,656250, 1867222224] |