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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 36 |
| 3 | 300 |
| 4 | 1485 |
| 5 | 3240 |
| 6 | 265356 |
| 7 | 265356 |
| 8 | 21520080 |
| 9 | 21520080 |
| 10 | 193720086 |
| 11 | 1743362676 |
| 12 | 141214502520 |
| 13 | 141214502520 |
| 14 | 11438393835996 |
| 15 | 11438393835996 |
| 16 | 926510072902560 |
| 17 | 926510072902560 |
| 18 | 75047317454789316 |
| 19 | 75047317454789316 |
| 20 | 6078832727785072200 |
| 21 | 6078832727785072200 |
[3,36,300,1485,3240,265356,265356,21520080, 21520080,193720086,1743362676,141214502520, 141214502520,11438393835996,11438393835996, 926510072902560,926510072902560,75047317454789316, 75047317454789316,6078832727785072200, 6078832727785072200] |