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| n | a(n) |
|---|---|
| 6 | 30 |
| 7 | 2310 |
| 8 | 42840 |
| 9 | 391545 |
| 10 | 2375100 |
| 11 | 10980585 |
| 12 | 41761720 |
| 13 | 136963255 |
| 14 | 399689290 |
| 15 | 1060984925 |
| 16 | 2603641040 |
| 17 | 5979294230 |
| 18 | 12973080120 |
| 19 | 26794003110 |
| 20 | 53000811600 |
| 21 | 100914240770 |
| 22 | 185718969590 |
| 23 | 331524753560 |
| 24 | 575738427880 |
| 25 | 975199600375 |
| 26 | 1614655942900 |
| 27 | 2618302433175 |
[30,2310,42840,391545,2375100,10980585,41761720, 136963255,399689290,1060984925,2603641040, 5979294230,12973080120,26794003110,53000811600, 100914240770,185718969590,331524753560, 575738427880,975199600375,1614655942900, 2618302433175] |