n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 6 |
4 | 21 |
5 | 100 |
6 | 1005 |
7 | 9170 |
8 | 73353 |
9 | 794952 |
10 | 11042745 |
11 | 144625118 |
12 | 1936131549 |
13 | 31475441452 |
14 | 562265168101 |
15 | 9960214270890 |
16 | 187956163443857 |
17 | 3970728871687824 |
18 | 88040662078595313 |
19 | 1994667867977462454 |
[1,0,1,6,21,100,1005,9170,73353,794952,11042745, 144625118,1936131549,31475441452,562265168101, 9960214270890,187956163443857,3970728871687824, 88040662078595313,1994667867977462454] |