n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 27 |
4 | 260 |
5 | 3175 |
6 | 47304 |
7 | 833147 |
8 | 16941120 |
9 | 390611331 |
10 | 10070060200 |
11 | 287028156162 |
12 | 8962583345856 |
13 | 304255011200647 |
14 | 11156593415089808 |
15 | 439452231820920000 |
16 | 18505340390664634384 |
17 | 829599437871129843839 |
18 | 39447684087807950938908 |
19 | 1983038000428208822539998 |
20 | 105080571577382659860160800 |
[1,1,4,27,260,3175,47304,833147,16941120, 390611331,10070060200,287028156162,8962583345856, 304255011200647,11156593415089808, 439452231820920000,18505340390664634384, 829599437871129843839,39447684087807950938908, 1983038000428208822539998, 105080571577382659860160800] |