n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 38 |
4 | 276 |
5 | 2276 |
6 | 21032 |
7 | 215336 |
8 | 2419824 |
9 | 29611120 |
10 | 391950240 |
11 | 5579965600 |
12 | 85018056640 |
13 | 1380373170880 |
14 | 23792373137280 |
15 | 433881469662080 |
16 | 8346202841391360 |
17 | 168894762064666880 |
18 | 3586667489988830720 |
19 | 79753496814542988800 |
[1,1,6,38,276,2276,21032,215336,2419824,29611120, 391950240,5579965600,85018056640,1380373170880, 23792373137280,433881469662080,8346202841391360, 168894762064666880,3586667489988830720, 79753496814542988800] |