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| n | a(n) |
|---|---|
| 6 | 203 |
| 7 | 4718 |
| 8 | 66808 |
| 9 | 750120 |
| 10 | 7370580 |
| 11 | 66562188 |
| 12 | 568136184 |
| 13 | 4663350120 |
| 14 | 37228965774 |
| 15 | 291297376370 |
| 16 | 2245876801168 |
| 17 | 17126594554160 |
| 18 | 129527848747752 |
| 19 | 973416393927768 |
| 20 | 7278979868039760 |
| 21 | 54211596845506800 |
| 22 | 402386221073227314 |
| 23 | 2977842560384800878 |
| 24 | 21977111826224423176 |
[203,4718,66808,750120,7370580,66562188,568136184, 4663350120,37228965774,291297376370,2245876801168, 17126594554160,129527848747752,973416393927768, 7278979868039760,54211596845506800, 402386221073227314,2977842560384800878, 21977111826224423176] |