n | a(n) |
---|---|
0 | 1 |
1 | 10 |
2 | 70 |
3 | 400 |
4 | 2020 |
5 | 9352 |
6 | 40600 |
7 | 167680 |
8 | 665440 |
9 | 2555840 |
10 | 9551936 |
11 | 34880000 |
12 | 124853120 |
13 | 439228160 |
14 | 1521839360 |
15 | 5202292736 |
16 | 17571249920 |
17 | 58712184320 |
18 | 194280061440 |
19 | 637228462080 |
20 | 2073332481024 |
21 | 6696470231040 |
[1,10,70,400,2020,9352,40600,167680,665440, 2555840,9551936,34880000,124853120,439228160, 1521839360,5202292736,17571249920,58712184320, 194280061440,637228462080,2073332481024, 6696470231040] |