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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 30 |
| 3 | 1040 |
| 4 | 68390 |
| 5 | 7322112 |
| 6 | 1161583500 |
| 7 | 256124504064 |
| 8 | 74951279707590 |
| 9 | 28111587450552320 |
| 10 | 13150168194612783620 |
| 11 | 7506080397628737060864 |
| 12 | 5134940145279960796279772 |
| 13 | 4147521174738722818202009600 |
| 14 | 3905319571990498174351316679000 |
| 15 | 4240383868623169668722969322455040 |
| 16 | 5259293239338602314365337386168258630 |
| 17 | 7389696615368349382565487880348756869120 |
[1,2,30,1040,68390,7322112,1161583500, 256124504064,74951279707590,28111587450552320, 13150168194612783620,7506080397628737060864, 5134940145279960796279772, 4147521174738722818202009600, 3905319571990498174351316679000, 4240383868623169668722969322455040, 5259293239338602314365337386168258630, 7389696615368349382565487880348756869120] |