n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 6 |
4 | 42 |
5 | 420 |
6 | 5155 |
7 | 77658 |
8 | 1376340 |
9 | 28133616 |
10 | 651317463 |
11 | 16846515510 |
12 | 481472570920 |
13 | 15067838554860 |
14 | 512473599799551 |
15 | 18821719654854998 |
16 | 742395982266536520 |
17 | 31299550394528466960 |
18 | 1404629090174946183156 |
19 | 66851805805525048040334 |
20 | 3363381327122496643643628 |
[1,1,6,42,420,5155,77658,1376340,28133616, 651317463,16846515510,481472570920,15067838554860, 512473599799551,18821719654854998, 742395982266536520,31299550394528466960, 1404629090174946183156,66851805805525048040334, 3363381327122496643643628] |