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| n | a(n) |
|---|---|
| 4 | 6 |
| 5 | 96 |
| 6 | 960 |
| 7 | 7680 |
| 8 | 53760 |
| 9 | 344064 |
| 10 | 2064384 |
| 11 | 11796480 |
| 12 | 64880640 |
| 13 | 346030080 |
| 14 | 1799356416 |
| 15 | 9160359936 |
| 16 | 45801799680 |
| 17 | 225485783040 |
| 18 | 1095216660480 |
| 19 | 5257039970304 |
| 20 | 24970939858944 |
| 21 | 117510305218560 |
| 22 | 548381424353280 |
| 23 | 2539871860162560 |
| 24 | 11683410556747776 |
| 25 | 53409876830846976 |
[6,96,960,7680,53760,344064,2064384,11796480, 64880640,346030080,1799356416,9160359936, 45801799680,225485783040,1095216660480, 5257039970304,24970939858944,117510305218560, 548381424353280,2539871860162560, 11683410556747776,53409876830846976] |