n | a(n) |
---|---|
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 4 |
7 | 6 |
8 | 19 |
9 | 49 |
10 | 150 |
11 | 442 |
12 | 1424 |
13 | 4522 |
14 | 14924 |
15 | 49536 |
16 | 167367 |
17 | 570285 |
18 | 1965058 |
19 | 6823410 |
20 | 23884366 |
21 | 84155478 |
22 | 298377508 |
23 | 1063750740 |
24 | 3811803164 |
25 | 13722384546 |
26 | 49611801980 |
27 | 180072089896 |
28 | 655977266884 |
29 | 2397708652276 |
30 | 8791599732140 |
31 | 32330394085528 |
[1,1,1,1,4,6,19,49,150,442,1424,4522,14924,49536, 167367,570285,1965058,6823410,23884366,84155478, 298377508,1063750740,3811803164,13722384546, 49611801980,180072089896,655977266884, 2397708652276,8791599732140,32330394085528] |