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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 24 |
| 3 | 320 |
| 4 | 6122 |
| 5 | 153762 |
| 6 | 4794664 |
| 7 | 178788528 |
| 8 | 7762727196 |
| 9 | 384733667780 |
| 10 | 21434922419504 |
| 11 | 1326212860090560 |
| 12 | 90227121642144424 |
| 13 | 6694736236093168200 |
| 14 | 538028902298395832832 |
| 15 | 46558260925421295229568 |
| 16 | 4316186393637505403773328 |
[1,3,24,320,6122,153762,4794664,178788528, 7762727196,384733667780,21434922419504, 1326212860090560,90227121642144424, 6694736236093168200,538028902298395832832, 46558260925421295229568,4316186393637505403773328] |