n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 120 |
6 | 720 |
7 | 4320 |
8 | 34560 |
9 | 311040 |
10 | 3110400 |
11 | 34214400 |
12 | 410572800 |
13 | 5337446400 |
14 | 75613824000 |
15 | 1134207360000 |
16 | 18147317760000 |
17 | 308504401920000 |
18 | 5553079234560000 |
19 | 105508505456640000 |
20 | 2110170109132800000 |
21 | 44288746761093120000 |
22 | 974352428744048640000 |
[1,1,2,6,24,120,720,4320,34560,311040,3110400, 34214400,410572800,5337446400,75613824000, 1134207360000,18147317760000,308504401920000, 5553079234560000,105508505456640000, 2110170109132800000,44288746761093120000, 974352428744048640000] |