n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 4 |
6 | 21 |
7 | 60 |
8 | 412 |
9 | 2912 |
10 | 48360 |
11 | 974787 |
12 | 56958187 |
13 | 2313100395 |
14 | 415655894822 |
15 | 24672742242739 |
16 | 14476157312171612 |
17 | 1201604193795794073 |
18 | 4552351087690759156124 |
19 | 597350655972004799844521 |
20 | 142501236416711876143177302627 |
[0,0,1,3,4,21,60,412,2912,48360,974787,56958187, 2313100395,415655894822,24672742242739, 14476157312171612,1201604193795794073, 4552351087690759156124,597350655972004799844521, 142501236416711876143177302627] |