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| n | a(n) |
|---|---|
| 5 | 120 |
| 6 | 360 |
| 7 | 2100 |
| 8 | 10080 |
| 9 | 58464 |
| 10 | 322560 |
| 11 | 1467840 |
| 12 | 7155720 |
| 13 | 36657192 |
| 14 | 179255076 |
| 15 | 933034830 |
| 16 | 4330631760 |
| 17 | 21529265392 |
| 18 | 105723750312 |
| 19 | 519686374512 |
| 20 | 2614195952160 |
| 21 | 12518753971164 |
| 22 | 61521911547096 |
| 23 | 302916858354682 |
| 24 | 1486023890700624 |
| 25 | 7449741849512920 |
| 26 | 35973707803032480 |
[120,360,2100,10080,58464,322560,1467840,7155720, 36657192,179255076,933034830,4330631760, 21529265392,105723750312,519686374512, 2614195952160,12518753971164,61521911547096, 302916858354682,1486023890700624,7449741849512920, 35973707803032480] |