n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 16 |
5 | 70 |
6 | 280 |
7 | 1168 |
8 | 4672 |
9 | 18884 |
10 | 75632 |
11 | 303368 |
12 | 1213472 |
13 | 4858064 |
14 | 19432256 |
15 | 77743040 |
16 | 310975520 |
17 | 1243959873 |
18 | 4975839492 |
19 | 19903598208 |
20 | 79614392832 |
21 | 318458493192 |
22 | 1273834028832 |
23 | 5095339755744 |
24 | 20381359022976 |
25 | 81525450936496 |
26 | 326101803775384 |
[1,1,4,16,70,280,1168,4672,18884,75632,303368, 1213472,4858064,19432256,77743040,310975520, 1243959873,4975839492,19903598208,79614392832, 318458493192,1273834028832,5095339755744, 20381359022976,81525450936496,326101803775384] |