n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 10 |
3 | 24 |
4 | 70 |
5 | 208 |
6 | 700 |
7 | 2344 |
8 | 8230 |
9 | 29144 |
10 | 104968 |
11 | 381304 |
12 | 1398500 |
13 | 5162224 |
14 | 19175140 |
15 | 71582944 |
16 | 268439590 |
17 | 1010580544 |
18 | 3817763740 |
19 | 14467258264 |
20 | 54975633976 |
21 | 209430787824 |
22 | 799645010860 |
23 | 3059510616424 |
24 | 11728124734500 |
25 | 45035996273872 |
26 | 173215372864600 |
27 | 667199944815064 |
[1,4,10,24,70,208,700,2344,8230,29144,104968, 381304,1398500,5162224,19175140,71582944, 268439590,1010580544,3817763740,14467258264, 54975633976,209430787824,799645010860, 3059510616424,11728124734500,45035996273872, 173215372864600,667199944815064] |