n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 7 |
6 | 23 |
7 | 71 |
8 | 255 |
9 | 911 |
10 | 3535 |
11 | 13903 |
12 | 57663 |
13 | 243871 |
14 | 1072031 |
15 | 4812575 |
16 | 22278399 |
17 | 105300287 |
18 | 510764095 |
19 | 2527547455 |
20 | 12794891007 |
21 | 66012404863 |
22 | 347599231103 |
23 | 1863520447103 |
24 | 10178746224639 |
25 | 56548686860543 |
26 | 319628408814847 |
27 | 1835814213846271 |
[1,1,1,3,7,23,71,255,911,3535,13903,57663,243871, 1072031,4812575,22278399,105300287,510764095, 2527547455,12794891007,66012404863,347599231103, 1863520447103,10178746224639,56548686860543, 319628408814847,1835814213846271] |