n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 21 |
6 | 82 |
7 | 354 |
8 | 1671 |
9 | 8536 |
10 | 46814 |
11 | 273907 |
12 | 1700828 |
13 | 11158746 |
14 | 77057021 |
15 | 558234902 |
16 | 4230337018 |
17 | 33448622893 |
18 | 275322101318 |
19 | 2354401779494 |
20 | 20878592918183 |
21 | 191682453823420 |
22 | 1819147694792802 |
[1,0,1,2,6,21,82,354,1671,8536,46814,273907, 1700828,11158746,77057021,558234902,4230337018, 33448622893,275322101318,2354401779494, 20878592918183,191682453823420,1819147694792802] |