n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 20 |
6 | 65 |
7 | 232 |
8 | 883 |
9 | 3581 |
10 | 15383 |
11 | 69579 |
12 | 329769 |
13 | 1631137 |
14 | 8391824 |
15 | 44777342 |
16 | 247182082 |
17 | 1408611456 |
18 | 8270902948 |
19 | 49953724226 |
20 | 309870713560 |
21 | 1971523962002 |
22 | 12849924998486 |
23 | 85702472618249 |
24 | 584305721381119 |
25 | 4068533850711783 |
26 | 28907888594859403 |
[1,1,1,2,7,20,65,232,883,3581,15383,69579,329769, 1631137,8391824,44777342,247182082,1408611456, 8270902948,49953724226,309870713560,1971523962002, 12849924998486,85702472618249,584305721381119, 4068533850711783,28907888594859403] |