n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 38 |
5 | 126 |
6 | 472 |
7 | 1716 |
8 | 6470 |
9 | 24310 |
10 | 92504 |
11 | 352716 |
12 | 1352540 |
13 | 5200300 |
14 | 20060016 |
15 | 77558760 |
16 | 300546630 |
17 | 1166803110 |
18 | 4537591960 |
19 | 17672631900 |
20 | 68923356788 |
21 | 269128937220 |
22 | 1052049834576 |
23 | 4116715363800 |
24 | 16123803193628 |
25 | 63205303218876 |
26 | 247959271674352 |
27 | 973469712824056 |
[1,1,4,10,38,126,472,1716,6470,24310,92504,352716, 1352540,5200300,20060016,77558760,300546630, 1166803110,4537591960,17672631900,68923356788, 269128937220,1052049834576,4116715363800, 16123803193628,63205303218876,247959271674352, 973469712824056] |