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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 30 |
| 3 | 492 |
| 4 | 11250 |
| 5 | 330282 |
| 6 | 11844288 |
| 7 | 501822108 |
| 8 | 24527880756 |
| 9 | 1358556883308 |
| 10 | 84094256900232 |
| 11 | 5753027212816320 |
| 12 | 431039748845205000 |
| 13 | 35102411472973316040 |
| 14 | 3087236653107610062240 |
| 15 | 291627772873980244894800 |
| 16 | 29447260745861893561906320 |
[1,3,30,492,11250,330282,11844288,501822108, 24527880756,1358556883308,84094256900232, 5753027212816320,431039748845205000, 35102411472973316040,3087236653107610062240, 291627772873980244894800, 29447260745861893561906320] |