n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 13 |
4 | 61 |
5 | 324 |
6 | 1800 |
7 | 10340 |
8 | 60969 |
9 | 366486 |
10 | 2237120 |
11 | 13829487 |
12 | 86394782 |
13 | 544547651 |
14 | 3458637273 |
15 | 22113504345 |
16 | 142212705879 |
17 | 919294844898 |
18 | 5969839457411 |
19 | 38927450022860 |
20 | 254776529381625 |
21 | 1673102335692514 |
22 | 11020847332241873 |
23 | 72798664086854460 |
[1,1,3,13,61,324,1800,10340,60969,366486,2237120, 13829487,86394782,544547651,3458637273, 22113504345,142212705879,919294844898, 5969839457411,38927450022860,254776529381625, 1673102335692514,11020847332241873, 72798664086854460] |