n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 5 |
7 | 19 |
8 | 66 |
9 | 218 |
10 | 700 |
11 | 2218 |
12 | 6997 |
13 | 22064 |
14 | 69662 |
15 | 220395 |
16 | 699090 |
17 | 2224114 |
18 | 7098773 |
19 | 22733498 |
20 | 73048903 |
21 | 235504760 |
22 | 761689193 |
23 | 2471105355 |
[0,0,0,0,0,1,5,19,66,218,700,2218,6997,22064, 69662,220395,699090,2224114,7098773,22733498, 73048903,235504760,761689193,2471105355] |