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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 5730 |
| 3 | 1696800 |
| 4 | 613591650 |
| 5 | 248832363780 |
| 6 | 108702332138400 |
| 7 | 50030418256790400 |
| 8 | 23933662070438513250 |
| 9 | 11795304320307625903500 |
| 10 | 5952113838155498195161980 |
| 11 | 3061813957188788125283450400 |
| 12 | 1600318610176809076206888362400 |
| 13 | 847745162264320796366122559544000 |
[1,30,5730,1696800,613591650,248832363780, 108702332138400,50030418256790400, 23933662070438513250,11795304320307625903500, 5952113838155498195161980, 3061813957188788125283450400, 1600318610176809076206888362400, 847745162264320796366122559544000] |