n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 24 |
3 | 90 |
4 | 336 |
5 | 1254 |
6 | 4680 |
7 | 17466 |
8 | 65184 |
9 | 243270 |
10 | 907896 |
11 | 3388314 |
12 | 12645360 |
13 | 47193126 |
14 | 176127144 |
15 | 657315450 |
16 | 2453134656 |
17 | 9155223174 |
18 | 34167758040 |
19 | 127515808986 |
20 | 475895477904 |
21 | 1776066102630 |
22 | 6628368932616 |
23 | 24737409627834 |
24 | 92321269578720 |
25 | 344547668687046 |
[1,6,24,90,336,1254,4680,17466,65184,243270, 907896,3388314,12645360,47193126,176127144, 657315450,2453134656,9155223174,34167758040, 127515808986,475895477904,1776066102630, 6628368932616,24737409627834,92321269578720, 344547668687046] |